## x^2 = (a^4 – b^4)(c^4 – d^4)

$x^2 \; = \; (a^4 - b^4) \,(c^4 - d^4)$

$2040^2 \; = \; (2^4 - 1^4) \,(23^4 - 7^4)$

$3567^2 \; = \; (5^4 - 4^4) \,(21^4 - 20^4)$

$7800^2 \; = \; (9^4 - 7^4) \,(11^4 - 2^4)$

$13920^2 \; = \; (7^4 - 3^4) \,(17^4 - 1^4)$

$62985^2 \; = \; (14^4 - 5^4) \,(18^4 - 1^4)$

$230880^2 \; = \; (17^4 - 9^4) \,(29^4 - 11^4)$

Find other solutions

Paul found:

$(2^4 - 1^4)(4^4 - 2^4) = 60^2$
$(2^4 - 1^4)(6^4 - 3^4) = 135^2$
$(2^4 - 1^4)(8^4 - 4^4) = 240^2$
$(3^4 - 2^4)(6^4 - 4^4) = 260^2$
$(3^4 - 1^4)(6^4 - 2^4) = 320^2$
$(2^4 - 1^4)(10^4 - 5^4) = 375^2$
$(3^4 - 2^4)(9^4 - 7^4) = 520^2$
$(2^4 - 1^4)(12^4 - 6^4) = (4^4 - 2^4)(6^4 - 3^4) = 540^2$
$(3^4 - 2^4)(9^4 - 6^4) = 585^2$
$(4^4 - 3^4)(8^4 - 6^4) = 700^2$
$(3^4 - 1^4)(9^4 - 3^4) = 720^2$
$(2^4 - 1^4)(14^4 - 7^4) = 735^2$
$(2^4 - 1^4)(16^4 - 8^4) = (4^4 - 2^4)(8^4 - 4^4) = 960^2$
$(3^4 - 2^4)(11^4 - 2^4) = 975^2$
$(4^4 - 1^4)(8^4 - 2^4) = 1020^2$
$(3^4 - 2^4)(12^4 - 8^4) = 1040^2$
$(2^4 - 1^4)(18^4 - 9^4) = 1215^2$
$(3^4 - 1^4)(12^4 - 4^4) = 1280^2$
$(5^4 - 4^4)(10^4 - 8^4) = 1476^2$
$(2^4 - 1^4)(20^4 - 10^4) = (4^4 - 2^4)(10^4 - 5^4) = 1500^2$
$(4^4 - 3^4)(12^4 - 9^4) = 1575^2$
$(3^4 - 2^4)(15^4 - 10^4) = 1625^2$
$(2^4 - 1^4)(22^4 - 11^4) = 1815^2$
$(3^4 - 1^4)(15^4 - 5^4) = 2000^2$
$(2^4 - 1^4)(23^4 - 7^4) = 2040^2$
$(3^4 - 2^4)(18^4 - 14^4) = (6^4 - 4^4)(9^4 - 7^4) = 2080^2$
$(2^4 - 1^4)(24^4 - 12^4) = (4^4 - 2^4)(12^4 - 6^4) = (6^4 - 3^4)(8^4 - 4^4) = 2160^2$
$(5^4 - 3^4)(10^4 - 6^4) = 2176^2$
$(4^4 - 1^4)(12^4 - 3^4) = 2295^2$
$(3^4 - 2^4)(18^4 - 12^4) = (6^4 - 4^4)(9^4 - 6^4) = 2340^2$
$(5^4 - 2^4)(10^4 - 4^4) = 2436^2$
$(5^4 - 1^4)(10^4 - 2^4) = 2496^2$
$(2^4 - 1^4)(26^4 - 13^4) = 2535^2$
$(6^4 - 5^4)(12^4 - 10^4) = 2684^2$
$(4^4 - 3^4)(16^4 - 12^4) = 2800^2$
$(3^4 - 1^4)(18^4 - 6^4) = (6^4 - 2^4)(9^4 - 3^4) = 2880^2$
$(2^4 - 1^4)(28^4 - 14^4) = (4^4 - 2^4)(14^4 - 7^4) = 2940^2$
$(3^4 - 2^4)(21^4 - 14^4) = 3185^2$
$(5^4 - 4^4)(15^4 - 12^4) = 3321^2$
$(2^4 - 1^4)(30^4 - 15^4) = (6^4 - 3^4)(10^4 - 5^4) = 3375^2$
$(5^4 - 4^4)(21^4 - 20^4) = 3567^2$
$(4^4 - 2^4)(16^4 - 8^4) = 3840^2$
$(3^4 - 2^4)(22^4 - 4^4) = (11^4 - 2^4)(6^4 - 4^4) = 3900^2$
$(3^4 - 1^4)(21^4 - 7^4) = 3920^2$
$(4^4 - 1^4)(16^4 - 4^4) = 4080^2$
$(3^4 - 2^4)(24^4 - 16^4) = (6^4 - 4^4)(12^4 - 8^4) = 4160^2$
$(4^4 - 3^4)(20^4 - 15^4) = 4375^2$
$(7^4 - 6^4)(14^4 - 12^4) = 4420^2$
$(3^4 - 2^4)(27^4 - 21^4) = (9^4 - 6^4)(9^4 - 7^4) = 4680^2$
$(4^4 - 2^4)(18^4 - 9^4) = 4860^2$
$(6^4 - 3^4)(12^4 - 6^4) = 4860^2$
$(5^4 - 3^4)(15^4 - 9^4) = 4896^2$
$(3^4 - 1^4)(24^4 - 8^4) = (6^4 - 2^4)(12^4 - 4^4) = 5120^2$
$(6^4 - 1^4)(12^4 - 2^4) = 5180^2$
$(3^4 - 2^4)(27^4 - 18^4) = 5265^2$
$(5^4 - 2^4)(15^4 - 6^4) = 5481^2$
$(5^4 - 1^4)(15^4 - 3^4) = 5616^2$
$(5^4 - 4^4)(20^4 - 16^4) = 5904^2$
$(4^4 - 2^4)(20^4 - 10^4) = (8^4 - 4^4)(10^4 - 5^4) = 6000^2$
$(6^4 - 5^4)(18^4 - 15^4) = 6039^2$
$(4^4 - 3^4)(24^4 - 18^4) = (8^4 - 6^4)(12^4 - 9^4) = 6300^2$
$(4^4 - 1^4)(20^4 - 5^4) = 6375^2$
$(3^4 - 1^4)(27^4 - 9^4) = 6480^2$
$(3^4 - 2^4)(30^4 - 20^4) = (6^4 - 4^4)(15^4 - 10^4) = 6500^2$
$(6^4 - 3^4)(14^4 - 7^4) = 6615^2$
$(8^4 - 7^4)(16^4 - 14^4) = 6780^2$
$(7^4 - 5^4)(14^4 - 10^4) = 7104^2$
$(4^4 - 2^4)(22^4 - 11^4) = 7260^2$
$(11^4 - 2^4)(9^4 - 7^4) = 7800^2$
$(3^4 - 1^4)(30^4 - 10^4) = (6^4 - 2^4)(15^4 - 5^4) = 8000^2$
$(4^4 - 2^4)(23^4 - 7^4) = 8160^2$
$(6^4 - 4^4)(18^4 - 14^4) = (9^4 - 7^4)(12^4 - 8^4) = 8320^2$
$(4^4 - 3^4)(28^4 - 21^4) = 8575^2$
$(7^4 - 4^4)(14^4 - 8^4) = 8580^2$
$(4^4 - 2^4)(24^4 - 12^4) = (6^4 - 3^4)(16^4 - 8^4) = (8^4 - 4^4)(12^4 - 6^4) = 8640^2$
$(5^4 - 3^4)(20^4 - 12^4) = 8704^2$
$(11^4 - 2^4)(9^4 - 6^4) = 8775^2$
$(4^4 - 1^4)(24^4 - 6^4) = (8^4 - 2^4)(12^4 - 3^4) = 9180^2$
$(5^4 - 4^4)(25^4 - 20^4) = 9225^2$
$(7^4 - 3^4)(14^4 - 6^4) = 9280^2$
$(6^4 - 4^4)(18^4 - 12^4) = (9^4 - 6^4)(12^4 - 8^4) = 9360^2$
$(7^4 - 2^4)(14^4 - 4^4) = 9540^2$
$(7^4 - 1^4)(14^4 - 2^4) = 9600^2$
$(5^4 - 2^4)(20^4 - 8^4) = 9744^2$
$(9^4 - 8^4)(18^4 - 16^4) = 9860^2$
$(7^4 - 6^4)(21^4 - 18^4) = 9945^2$
$(5^4 - 1^4)(20^4 - 4^4) = 9984^2$
$(4^4 - 2^4)(26^4 - 13^4) = 10140^2$
$(6^4 - 5^4)(24^4 - 20^4) = 10736^2$
$(6^4 - 3^4)(18^4 - 9^4) = 10935^2$
$(8^4 - 6^4)(16^4 - 12^4) = 11200^2$
$(6^4 - 2^4)(18^4 - 6^4) = (9^4 - 3^4)(12^4 - 4^4) = 11520^2$
$(6^4 - 1^4)(18^4 - 3^4) = 11655^2$
$(4^4 - 2^4)(28^4 - 14^4) = (8^4 - 4^4)(14^4 - 7^4) = 11760^2$
$(4^4 - 1^4)(28^4 - 7^4) = 12495^2$
$(6^4 - 4^4)(21^4 - 14^4) = 12740^2$
$(9^4 - 7^4)(15^4 - 10^4) = 13000^2$
$(5^4 - 4^4)(30^4 - 24^4) = (10^4 - 8^4)(15^4 - 12^4) = 13284^2$
$(4^4 - 2^4)(30^4 - 15^4) = (6^4 - 3^4)(20^4 - 10^4) = (10^4 - 5^4)(12^4 - 6^4) = 13500^2$
$(5^4 - 3^4)(25^4 - 15^4) = 13600^2$
$(10^4 - 9^4)(20^4 - 18^4) = 13756^2$
$(8^4 - 5^4)(16^4 - 10^4) = 13884^2$
$(17^4 - 1^4)(7^4 - 3^4) = 13920^2$
$(10^4 - 8^4)(21^4 - 20^4) = 14268^2$
$(9^4 - 6^4)(15^4 - 10^4) = 14625^2$
$(5^4 - 2^4)(25^4 - 10^4) = 15225^2$
$(8^4 - 7^4)(24^4 - 21^4) = 15255^2$
$(8^4 - 4^4)(16^4 - 8^4) = 15360^2$
$(5^4 - 1^4)(25^4 - 5^4) = (6^4 - 4^4)(22^4 - 4^4) = (11^4 - 2^4)(12^4 - 8^4) = 15600^2$
$(6^4 - 2^4)(21^4 - 7^4) = 15680^2$
$(7^4 - 5^4)(21^4 - 15^4) = 15984^2$
$(8^4 - 3^4)(16^4 - 6^4) = 16060^2$
$(8^4 - 2^4)(16^4 - 4^4) = 16320^2$
$(6^4 - 3^4)(22^4 - 11^4) = 16335^2$
$(8^4 - 1^4)(16^4 - 2^4) = 16380^2$
$(6^4 - 4^4)(24^4 - 16^4) = (9^4 - 7^4)(18^4 - 14^4) = 16640^2$
$(6^4 - 5^4)(30^4 - 25^4) = 16775^2$
$(8^4 - 6^4)(20^4 - 15^4) = 17500^2$
$(7^4 - 6^4)(28^4 - 24^4) = 17680^2$
$(9^4 - 3^4)(15^4 - 5^4) = 18000^2$
$(6^4 - 3^4)(23^4 - 7^4) = 18360^2$
$(10^4 - 5^4)(14^4 - 7^4) = 18375^2$
$(11^4 - 10^4)(22^4 - 20^4) = 18564^2$
$(6^4 - 4^4)(27^4 - 21^4) = 18720^2$
$(9^4 - 6^4)(18^4 - 14^4) = (9^4 - 7^4)(18^4 - 12^4) = 18720^2$
$(7^4 - 4^4)(21^4 - 12^4) = 19305^2$
$(6^4 - 3^4)(24^4 - 12^4) = (8^4 - 4^4)(18^4 - 9^4) = 19440^2$
$(5^4 - 3^4)(30^4 - 18^4) = (10^4 - 6^4)(15^4 - 9^4) = 19584^2$
$(6^4 - 2^4)(24^4 - 8^4) = 20480^2$
$(6^4 - 1^4)(24^4 - 4^4) = 20720^2$
$(7^4 - 3^4)(21^4 - 9^4) = 20880^2$
$(6^4 - 4^4)(27^4 - 18^4) = (9^4 - 6^4)(18^4 - 12^4) = 21060^2$
$(7^4 - 2^4)(21^4 - 6^4) = 21465^2$
$(7^4 - 1^4)(21^4 - 3^4) = 21600^2$
$(5^4 - 2^4)(30^4 - 12^4) = (10^4 - 4^4)(15^4 - 6^4) = 21924^2$
$(9^4 - 8^4)(27^4 - 24^4) = 22185^2$
$(5^4 - 1^4)(30^4 - 6^4) = (10^4 - 2^4)(15^4 - 3^4) = 22464^2$
$(6^4 - 3^4)(26^4 - 13^4) = 22815^2$
$(10^4 - 8^4)(20^4 - 16^4) = 23616^2$
$(9^4 - 5^4)(18^4 - 10^4) = 23744^2$
$(8^4 - 4^4)(20^4 - 10^4) = (10^4 - 5^4)(16^4 - 8^4) = 24000^2$
$(12^4 - 10^4)(18^4 - 15^4) = 24156^2$
$(11^4 - 2^4)(15^4 - 10^4) = 24375^2$
$(12^4 - 11^4)(24^4 - 22^4) = 24380^2$
$(8^4 - 6^4)(24^4 - 18^4) = (12^4 - 9^4)(16^4 - 12^4) = 25200^2$
$(9^4 - 4^4)(18^4 - 8^4) = 25220^2$
$(9^4 - 7^4)(21^4 - 14^4) = 25480^2$
$(8^4 - 2^4)(20^4 - 5^4) = 25500^2$
$(6^4 - 2^4)(27^4 - 9^4) = (9^4 - 3^4)(18^4 - 6^4) = 25920^2$
$(6^4 - 4^4)(30^4 - 20^4) = (12^4 - 8^4)(15^4 - 10^4) = 26000^2$
$(9^4 - 2^4)(18^4 - 4^4) = 26180^2$
$(9^4 - 1^4)(18^4 - 2^4) = 26240^2$
$(6^4 - 3^4)(28^4 - 14^4) = (12^4 - 6^4)(14^4 - 7^4) = 26460^2$
$(7^4 - 5^4)(28^4 - 20^4) = 28416^2$
$(9^4 - 6^4)(21^4 - 14^4) = 28665^2$
$(8^4 - 4^4)(22^4 - 11^4) = 29040^2$
$(6^4 - 3^4)(30^4 - 15^4) = (10^4 - 5^4)(18^4 - 9^4) = 30375^2$
$(10^4 - 7^4)(20^4 - 14^4) = 30396^2$
$(10^4 - 9^4)(30^4 - 27^4) = 30951^2$
$(11^4 - 2^4)(18^4 - 14^4) = (22^4 - 4^4)(9^4 - 7^4) = 31200^2$
$(8^4 - 5^4)(24^4 - 15^4) = 31239^2$
$(13^4 - 12^4)(26^4 - 24^4) = 31300^2$
$(6^4 - 2^4)(30^4 - 10^4) = (12^4 - 4^4)(15^4 - 5^4) = 32000^2$
$(15^4 - 12^4)(21^4 - 20^4) = 32103^2$
$(11^4 - 9^4)(22^4 - 18^4) = 32320^2$
$(6^4 - 1^4)(30^4 - 5^4) = 32375^2$
$(8^4 - 4^4)(23^4 - 7^4) = 32640^2$
$(9^4 - 7^4)(24^4 - 16^4) = (12^4 - 8^4)(18^4 - 14^4) = 33280^2$
$(8^4 - 6^4)(28^4 - 21^4) = 34300^2$
$(7^4 - 4^4)(28^4 - 16^4) = 34320^2$
$(8^4 - 4^4)(24^4 - 12^4) = (12^4 - 6^4)(16^4 - 8^4) = 34560^2$
$(10^4 - 6^4)(20^4 - 12^4) = 34816^2$
$(11^4 - 2^4)(18^4 - 12^4) = (22^4 - 4^4)(9^4 - 6^4) = 35100^2$
$(9^4 - 3^4)(21^4 - 7^4) = 35280^2$
$(8^4 - 3^4)(24^4 - 9^4) = 36135^2$
$(8^4 - 2^4)(24^4 - 6^4) = (12^4 - 3^4)(16^4 - 4^4) = 36720^2$
$(8^4 - 1^4)(24^4 - 3^4) = 36855^2$
$(10^4 - 8^4)(25^4 - 20^4) = 36900^2$
$(7^4 - 3^4)(28^4 - 12^4) = 37120^2$
$(9^4 - 6^4)(24^4 - 16^4)=(9^4 - 7^4)(27^4 - 21^4)=(12^4 - 8^4)(18^4 - 12^4)=37440^2$
$(10^4 - 5^4)(20^4 - 10^4) = 37500^2$
$(7^4 - 2^4)(28^4 - 8^4) = 38160^2$
$(7^4 - 1^4)(28^4 - 4^4) = 38400^2$
$(10^4 - 4^4)(20^4 - 8^4) = 38976^2$
$(12^4 - 9^4)(20^4 - 15^4) = 39375^2$
$(14^4 - 13^4)(28^4 - 26^4) = 39420^2$
$(10^4 - 3^4)(20^4 - 6^4) = 39676^2$
$(14^4 - 12^4)(21^4 - 18^4) = 39780^2$
$(10^4 - 2^4)(20^4 - 4^4) = 39936^2$
$(10^4 - 1^4)(20^4 - 2^4) = 39996^2$
$(8^4 - 4^4)(26^4 - 13^4) = 40560^2$
$(9^4 - 6^4)(27^4 - 21^4) = (9^4 - 7^4)(27^4 - 18^4) = 42120^2$
$(11^4 - 8^4)(22^4 - 16^4) = 42180^2$
$(12^4 - 10^4)(24^4 - 20^4) = 42944^2$
$(12^4 - 6^4)(18^4 - 9^4) = 43740^2$
$(10^4 - 5^4)(22^4 - 11^4) = 45375^2$
$(9^4 - 3^4)(24^4 - 8^4) = (12^4 - 4^4)(18^4 - 6^4) = 46080^2$

math grad - Interest: Number theory
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### One Response to x^2 = (a^4 – b^4)(c^4 – d^4)

1. paul says:

With {a, b, c, d} <=30 we have, sorted by the square value.

(2^4 – 1^4)(4^4 – 2^4) = 60^2
(2^4 – 1^4)(6^4 – 3^4) = 135^2
(2^4 – 1^4)(8^4 – 4^4) = 240^2
(3^4 – 2^4)(6^4 – 4^4) = 260^2
(3^4 – 1^4)(6^4 – 2^4) = 320^2
(2^4 – 1^4)(10^4 – 5^4) = 375^2
(3^4 – 2^4)(9^4 – 7^4) = 520^2
(2^4 – 1^4)(12^4 – 6^4) = 540^2
(4^4 – 2^4)(6^4 – 3^4) = 540^2
(3^4 – 2^4)(9^4 – 6^4) = 585^2
(4^4 – 3^4)(8^4 – 6^4) = 700^2
(3^4 – 1^4)(9^4 – 3^4) = 720^2
(2^4 – 1^4)(14^4 – 7^4) = 735^2
(2^4 – 1^4)(16^4 – 8^4) = 960^2
(4^4 – 2^4)(8^4 – 4^4) = 960^2
(3^4 – 2^4)(11^4 – 2^4) = 975^2
(4^4 – 1^4)(8^4 – 2^4) = 1020^2
(3^4 – 2^4)(12^4 – 8^4) = 1040^2
(2^4 – 1^4)(18^4 – 9^4) = 1215^2
(3^4 – 1^4)(12^4 – 4^4) = 1280^2
(5^4 – 4^4)(10^4 – 8^4) = 1476^2
(2^4 – 1^4)(20^4 – 10^4) = 1500^2
(4^4 – 2^4)(10^4 – 5^4) = 1500^2
(4^4 – 3^4)(12^4 – 9^4) = 1575^2
(3^4 – 2^4)(15^4 – 10^4) = 1625^2
(2^4 – 1^4)(22^4 – 11^4) = 1815^2
(3^4 – 1^4)(15^4 – 5^4) = 2000^2
(2^4 – 1^4)(23^4 – 7^4) = 2040^2
(3^4 – 2^4)(18^4 – 14^4) = 2080^2
(6^4 – 4^4)(9^4 – 7^4) = 2080^2
(2^4 – 1^4)(24^4 – 12^4) = 2160^2
(4^4 – 2^4)(12^4 – 6^4) = 2160^2
(6^4 – 3^4)(8^4 – 4^4) = 2160^2
(5^4 – 3^4)(10^4 – 6^4) = 2176^2
(4^4 – 1^4)(12^4 – 3^4) = 2295^2
(3^4 – 2^4)(18^4 – 12^4) = 2340^2
(6^4 – 4^4)(9^4 – 6^4) = 2340^2
(5^4 – 2^4)(10^4 – 4^4) = 2436^2
(5^4 – 1^4)(10^4 – 2^4) = 2496^2
(2^4 – 1^4)(26^4 – 13^4) = 2535^2
(6^4 – 5^4)(12^4 – 10^4) = 2684^2
(4^4 – 3^4)(16^4 – 12^4) = 2800^2
(3^4 – 1^4)(18^4 – 6^4) = 2880^2
(6^4 – 2^4)(9^4 – 3^4) = 2880^2
(2^4 – 1^4)(28^4 – 14^4) = 2940^2
(4^4 – 2^4)(14^4 – 7^4) = 2940^2
(3^4 – 2^4)(21^4 – 14^4) = 3185^2
(5^4 – 4^4)(15^4 – 12^4) = 3321^2
(2^4 – 1^4)(30^4 – 15^4) = 3375^2
(6^4 – 3^4)(10^4 – 5^4) = 3375^2
(5^4 – 4^4)(21^4 – 20^4) = 3567^2
(4^4 – 2^4)(16^4 – 8^4) = 3840^2
(3^4 – 2^4)(22^4 – 4^4) = 3900^2
(11^4 – 2^4)(6^4 – 4^4) = 3900^2
(3^4 – 1^4)(21^4 – 7^4) = 3920^2
(4^4 – 1^4)(16^4 – 4^4) = 4080^2
(3^4 – 2^4)(24^4 – 16^4) = 4160^2
(6^4 – 4^4)(12^4 – 8^4) = 4160^2
(4^4 – 3^4)(20^4 – 15^4) = 4375^2
(7^4 – 6^4)(14^4 – 12^4) = 4420^2
(3^4 – 2^4)(27^4 – 21^4) = 4680^2
(9^4 – 6^4)(9^4 – 7^4) = 4680^2
(4^4 – 2^4)(18^4 – 9^4) = 4860^2
(6^4 – 3^4)(12^4 – 6^4) = 4860^2
(5^4 – 3^4)(15^4 – 9^4) = 4896^2
(3^4 – 1^4)(24^4 – 8^4) = 5120^2
(6^4 – 2^4)(12^4 – 4^4) = 5120^2
(6^4 – 1^4)(12^4 – 2^4) = 5180^2
(3^4 – 2^4)(27^4 – 18^4) = 5265^2
(5^4 – 2^4)(15^4 – 6^4) = 5481^2
(5^4 – 1^4)(15^4 – 3^4) = 5616^2
(5^4 – 4^4)(20^4 – 16^4) = 5904^2
(4^4 – 2^4)(20^4 – 10^4) = 6000^2
(8^4 – 4^4)(10^4 – 5^4) = 6000^2
(6^4 – 5^4)(18^4 – 15^4) = 6039^2
(4^4 – 3^4)(24^4 – 18^4) = 6300^2
(8^4 – 6^4)(12^4 – 9^4) = 6300^2
(4^4 – 1^4)(20^4 – 5^4) = 6375^2
(3^4 – 1^4)(27^4 – 9^4) = 6480^2
(3^4 – 2^4)(30^4 – 20^4) = 6500^2
(6^4 – 4^4)(15^4 – 10^4) = 6500^2
(6^4 – 3^4)(14^4 – 7^4) = 6615^2
(8^4 – 7^4)(16^4 – 14^4) = 6780^2
(7^4 – 5^4)(14^4 – 10^4) = 7104^2
(4^4 – 2^4)(22^4 – 11^4) = 7260^2
(11^4 – 2^4)(9^4 – 7^4) = 7800^2
(3^4 – 1^4)(30^4 – 10^4) = 8000^2
(6^4 – 2^4)(15^4 – 5^4) = 8000^2
(4^4 – 2^4)(23^4 – 7^4) = 8160^2
(6^4 – 4^4)(18^4 – 14^4) = 8320^2
(9^4 – 7^4)(12^4 – 8^4) = 8320^2
(4^4 – 3^4)(28^4 – 21^4) = 8575^2
(7^4 – 4^4)(14^4 – 8^4) = 8580^2
(4^4 – 2^4)(24^4 – 12^4) = 8640^2
(6^4 – 3^4)(16^4 – 8^4) = 8640^2
(8^4 – 4^4)(12^4 – 6^4) = 8640^2
(5^4 – 3^4)(20^4 – 12^4) = 8704^2
(11^4 – 2^4)(9^4 – 6^4) = 8775^2
(4^4 – 1^4)(24^4 – 6^4) = 9180^2
(8^4 – 2^4)(12^4 – 3^4) = 9180^2
(5^4 – 4^4)(25^4 – 20^4) = 9225^2
(7^4 – 3^4)(14^4 – 6^4) = 9280^2
(6^4 – 4^4)(18^4 – 12^4) = 9360^2
(9^4 – 6^4)(12^4 – 8^4) = 9360^2
(7^4 – 2^4)(14^4 – 4^4) = 9540^2
(7^4 – 1^4)(14^4 – 2^4) = 9600^2
(5^4 – 2^4)(20^4 – 8^4) = 9744^2
(9^4 – 8^4)(18^4 – 16^4) = 9860^2
(7^4 – 6^4)(21^4 – 18^4) = 9945^2
(5^4 – 1^4)(20^4 – 4^4) = 9984^2
(4^4 – 2^4)(26^4 – 13^4) = 10140^2
(6^4 – 5^4)(24^4 – 20^4) = 10736^2
(6^4 – 3^4)(18^4 – 9^4) = 10935^2
(8^4 – 6^4)(16^4 – 12^4) = 11200^2
(6^4 – 2^4)(18^4 – 6^4) = 11520^2
(9^4 – 3^4)(12^4 – 4^4) = 11520^2
(6^4 – 1^4)(18^4 – 3^4) = 11655^2
(4^4 – 2^4)(28^4 – 14^4) = 11760^2
(8^4 – 4^4)(14^4 – 7^4) = 11760^2
(4^4 – 1^4)(28^4 – 7^4) = 12495^2
(6^4 – 4^4)(21^4 – 14^4) = 12740^2
(9^4 – 7^4)(15^4 – 10^4) = 13000^2
(5^4 – 4^4)(30^4 – 24^4) = 13284^2
(10^4 – 8^4)(15^4 – 12^4) = 13284^2
(4^4 – 2^4)(30^4 – 15^4) = 13500^2
(6^4 – 3^4)(20^4 – 10^4) = 13500^2
(10^4 – 5^4)(12^4 – 6^4) = 13500^2
(5^4 – 3^4)(25^4 – 15^4) = 13600^2
(10^4 – 9^4)(20^4 – 18^4) = 13756^2
(8^4 – 5^4)(16^4 – 10^4) = 13884^2
(17^4 – 1^4)(7^4 – 3^4) = 13920^2
(10^4 – 8^4)(21^4 – 20^4) = 14268^2
(9^4 – 6^4)(15^4 – 10^4) = 14625^2
(5^4 – 2^4)(25^4 – 10^4) = 15225^2
(8^4 – 7^4)(24^4 – 21^4) = 15255^2
(8^4 – 4^4)(16^4 – 8^4) = 15360^2
(5^4 – 1^4)(25^4 – 5^4) = 15600^2
(6^4 – 4^4)(22^4 – 4^4) = 15600^2
(11^4 – 2^4)(12^4 – 8^4) = 15600^2
(6^4 – 2^4)(21^4 – 7^4) = 15680^2
(7^4 – 5^4)(21^4 – 15^4) = 15984^2
(8^4 – 3^4)(16^4 – 6^4) = 16060^2
(8^4 – 2^4)(16^4 – 4^4) = 16320^2
(6^4 – 3^4)(22^4 – 11^4) = 16335^2
(8^4 – 1^4)(16^4 – 2^4) = 16380^2
(6^4 – 4^4)(24^4 – 16^4) = 16640^2
(9^4 – 7^4)(18^4 – 14^4) = 16640^2
(6^4 – 5^4)(30^4 – 25^4) = 16775^2
(8^4 – 6^4)(20^4 – 15^4) = 17500^2
(7^4 – 6^4)(28^4 – 24^4) = 17680^2
(9^4 – 3^4)(15^4 – 5^4) = 18000^2
(6^4 – 3^4)(23^4 – 7^4) = 18360^2
(10^4 – 5^4)(14^4 – 7^4) = 18375^2
(11^4 – 10^4)(22^4 – 20^4) = 18564^2
(6^4 – 4^4)(27^4 – 21^4) = 18720^2
(9^4 – 6^4)(18^4 – 14^4) = 18720^2
(9^4 – 7^4)(18^4 – 12^4) = 18720^2
(7^4 – 4^4)(21^4 – 12^4) = 19305^2
(6^4 – 3^4)(24^4 – 12^4) = 19440^2
(8^4 – 4^4)(18^4 – 9^4) = 19440^2
(5^4 – 3^4)(30^4 – 18^4) = 19584^2
(10^4 – 6^4)(15^4 – 9^4) = 19584^2
(6^4 – 2^4)(24^4 – 8^4) = 20480^2
(6^4 – 1^4)(24^4 – 4^4) = 20720^2
(7^4 – 3^4)(21^4 – 9^4) = 20880^2
(6^4 – 4^4)(27^4 – 18^4) = 21060^2
(9^4 – 6^4)(18^4 – 12^4) = 21060^2
(7^4 – 2^4)(21^4 – 6^4) = 21465^2
(7^4 – 1^4)(21^4 – 3^4) = 21600^2
(5^4 – 2^4)(30^4 – 12^4) = 21924^2
(10^4 – 4^4)(15^4 – 6^4) = 21924^2
(9^4 – 8^4)(27^4 – 24^4) = 22185^2
(5^4 – 1^4)(30^4 – 6^4) = 22464^2
(10^4 – 2^4)(15^4 – 3^4) = 22464^2
(6^4 – 3^4)(26^4 – 13^4) = 22815^2
(10^4 – 8^4)(20^4 – 16^4) = 23616^2
(9^4 – 5^4)(18^4 – 10^4) = 23744^2
(8^4 – 4^4)(20^4 – 10^4) = 24000^2
(10^4 – 5^4)(16^4 – 8^4) = 24000^2
(12^4 – 10^4)(18^4 – 15^4) = 24156^2
(11^4 – 2^4)(15^4 – 10^4) = 24375^2
(12^4 – 11^4)(24^4 – 22^4) = 24380^2
(8^4 – 6^4)(24^4 – 18^4) = 25200^2
(12^4 – 9^4)(16^4 – 12^4) = 25200^2
(9^4 – 4^4)(18^4 – 8^4) = 25220^2
(9^4 – 7^4)(21^4 – 14^4) = 25480^2
(8^4 – 2^4)(20^4 – 5^4) = 25500^2
(6^4 – 2^4)(27^4 – 9^4) = 25920^2
(9^4 – 3^4)(18^4 – 6^4) = 25920^2
(6^4 – 4^4)(30^4 – 20^4) = 26000^2
(12^4 – 8^4)(15^4 – 10^4) = 26000^2
(9^4 – 2^4)(18^4 – 4^4) = 26180^2
(9^4 – 1^4)(18^4 – 2^4) = 26240^2
(6^4 – 3^4)(28^4 – 14^4) = 26460^2
(12^4 – 6^4)(14^4 – 7^4) = 26460^2
(7^4 – 5^4)(28^4 – 20^4) = 28416^2
(9^4 – 6^4)(21^4 – 14^4) = 28665^2
(8^4 – 4^4)(22^4 – 11^4) = 29040^2
(6^4 – 3^4)(30^4 – 15^4) = 30375^2
(10^4 – 5^4)(18^4 – 9^4) = 30375^2
(10^4 – 7^4)(20^4 – 14^4) = 30396^2
(10^4 – 9^4)(30^4 – 27^4) = 30951^2
(11^4 – 2^4)(18^4 – 14^4) = 31200^2
(22^4 – 4^4)(9^4 – 7^4) = 31200^2
(8^4 – 5^4)(24^4 – 15^4) = 31239^2
(13^4 – 12^4)(26^4 – 24^4) = 31300^2
(6^4 – 2^4)(30^4 – 10^4) = 32000^2
(12^4 – 4^4)(15^4 – 5^4) = 32000^2
(15^4 – 12^4)(21^4 – 20^4) = 32103^2
(11^4 – 9^4)(22^4 – 18^4) = 32320^2
(6^4 – 1^4)(30^4 – 5^4) = 32375^2
(8^4 – 4^4)(23^4 – 7^4) = 32640^2
(9^4 – 7^4)(24^4 – 16^4) = 33280^2
(12^4 – 8^4)(18^4 – 14^4) = 33280^2
(8^4 – 6^4)(28^4 – 21^4) = 34300^2
(7^4 – 4^4)(28^4 – 16^4) = 34320^2
(8^4 – 4^4)(24^4 – 12^4) = 34560^2
(12^4 – 6^4)(16^4 – 8^4) = 34560^2
(10^4 – 6^4)(20^4 – 12^4) = 34816^2
(11^4 – 2^4)(18^4 – 12^4) = 35100^2
(22^4 – 4^4)(9^4 – 6^4) = 35100^2
(9^4 – 3^4)(21^4 – 7^4) = 35280^2
(8^4 – 3^4)(24^4 – 9^4) = 36135^2
(8^4 – 2^4)(24^4 – 6^4) = 36720^2
(12^4 – 3^4)(16^4 – 4^4) = 36720^2
(8^4 – 1^4)(24^4 – 3^4) = 36855^2
(10^4 – 8^4)(25^4 – 20^4) = 36900^2
(7^4 – 3^4)(28^4 – 12^4) = 37120^2
(9^4 – 6^4)(24^4 – 16^4) = 37440^2
(9^4 – 7^4)(27^4 – 21^4) = 37440^2
(12^4 – 8^4)(18^4 – 12^4) = 37440^2
(10^4 – 5^4)(20^4 – 10^4) = 37500^2
(7^4 – 2^4)(28^4 – 8^4) = 38160^2
(7^4 – 1^4)(28^4 – 4^4) = 38400^2
(10^4 – 4^4)(20^4 – 8^4) = 38976^2
(12^4 – 9^4)(20^4 – 15^4) = 39375^2
(14^4 – 13^4)(28^4 – 26^4) = 39420^2
(10^4 – 3^4)(20^4 – 6^4) = 39676^2
(14^4 – 12^4)(21^4 – 18^4) = 39780^2
(10^4 – 2^4)(20^4 – 4^4) = 39936^2
(10^4 – 1^4)(20^4 – 2^4) = 39996^2
(8^4 – 4^4)(26^4 – 13^4) = 40560^2
(9^4 – 6^4)(27^4 – 21^4) = 42120^2
(9^4 – 7^4)(27^4 – 18^4) = 42120^2
(11^4 – 8^4)(22^4 – 16^4) = 42180^2
(12^4 – 10^4)(24^4 – 20^4) = 42944^2
(12^4 – 6^4)(18^4 – 9^4) = 43740^2
(10^4 – 5^4)(22^4 – 11^4) = 45375^2
(9^4 – 3^4)(24^4 – 8^4) = 46080^2
(12^4 – 4^4)(18^4 – 6^4) = 46080^2
(12^4 – 2^4)(18^4 – 3^4) = 46620^2
(8^4 – 4^4)(28^4 – 14^4) = 47040^2
(14^4 – 7^4)(16^4 – 8^4) = 47040^2
(9^4 – 6^4)(27^4 – 18^4) = 47385^2
(11^4 – 2^4)(21^4 – 14^4) = 47775^2
(15^4 – 14^4)(30^4 – 28^4) = 48836^2
(11^4 – 7^4)(22^4 – 14^4) = 48960^2
(8^4 – 2^4)(28^4 – 7^4) = 49980^2
(12^4 – 8^4)(21^4 – 14^4) = 50960^2
(10^4 – 5^4)(23^4 – 7^4) = 51000^2
(9^4 – 7^4)(30^4 – 20^4) = 52000^2
(15^4 – 10^4)(18^4 – 14^4) = 52000^2
(10^4 – 8^4)(30^4 – 24^4) = 53136^2
(15^4 – 12^4)(20^4 – 16^4) = 53136^2
(11^4 – 6^4)(22^4 – 12^4) = 53380^2
(9^4 – 5^4)(27^4 – 15^4) = 53424^2
(8^4 – 4^4)(30^4 – 15^4) = 54000^2
(10^4 – 5^4)(24^4 – 12^4) = 54000^2
(12^4 – 6^4)(20^4 – 10^4) = 54000^2
(10^4 – 6^4)(25^4 – 15^4) = 54400^2
(13^4 – 11^4)(26^4 – 22^4) = 55680^2
(17^4 – 1^4)(14^4 – 6^4) = 55680^2
(11^4 – 5^4)(22^4 – 10^4) = 56064^2
(12^4 – 9^4)(24^4 – 18^4) = 56700^2
(9^4 – 4^4)(27^4 – 12^4) = 56745^2
(20^4 – 16^4)(21^4 – 20^4) = 57072^2
(12^4 – 3^4)(20^4 – 5^4) = 57375^2
(11^4 – 4^4)(22^4 – 8^4) = 57540^2
(11^4 – 3^4)(22^4 – 6^4) = 58240^2
(9^4 – 3^4)(27^4 – 9^4) = 58320^2
(9^4 – 6^4)(30^4 – 20^4) = 58500^2
(11^4 – 2^4)(22^4 – 4^4) = 58500^2
(15^4 – 10^4)(18^4 – 12^4) = 58500^2
(11^4 – 1^4)(22^4 – 2^4) = 58560^2
(9^4 – 2^4)(27^4 – 6^4) = 58905^2
(9^4 – 1^4)(27^4 – 3^4) = 59040^2
(14^4 – 7^4)(18^4 – 9^4) = 59535^2
(10^4 – 4^4)(25^4 – 10^4) = 60900^2
(16^4 – 14^4)(24^4 – 21^4) = 61020^2
(10^4 – 2^4)(25^4 – 5^4) = 62400^2
(11^4 – 2^4)(24^4 – 16^4) = 62400^2
(22^4 – 4^4)(12^4 – 8^4) = 62400^2
(12^4 – 4^4)(21^4 – 7^4) = 62720^2
(18^4 – 1^4)(14^4 – 5^4) = 62985^2
(10^4 – 5^4)(26^4 – 13^4) = 63375^2
(14^4 – 10^4)(21^4 – 15^4) = 63936^2
(12^4 – 6^4)(22^4 – 11^4) = 65340^2
(12^4 – 8^4)(24^4 – 16^4) = 66560^2
(12^4 – 10^4)(30^4 – 25^4) = 67100^2
(10^4 – 7^4)(30^4 – 21^4) = 68391^2
(16^4 – 12^4)(20^4 – 15^4) = 70000^2
(11^4 – 2^4)(27^4 – 21^4) = 70200^2
(14^4 – 12^4)(28^4 – 24^4) = 70720^2
(9^4 – 3^4)(30^4 – 10^4) = 72000^2
(15^4 – 5^4)(18^4 – 6^4) = 72000^2
(12^4 – 7^4)(24^4 – 14^4) = 73340^2
(12^4 – 6^4)(23^4 – 7^4) = 73440^2
(10^4 – 5^4)(28^4 – 14^4) = 73500^2
(14^4 – 7^4)(20^4 – 10^4) = 73500^2
(13^4 – 10^4)(26^4 – 20^4) = 74244^2
(12^4 – 8^4)(27^4 – 21^4) = 74880^2
(18^4 – 12^4)(18^4 – 14^4) = 74880^2
(12^4 – 9^4)(28^4 – 21^4) = 77175^2
(14^4 – 8^4)(21^4 – 12^4) = 77220^2
(12^4 – 6^4)(24^4 – 12^4) = 77760^2
(16^4 – 8^4)(18^4 – 9^4) = 77760^2
(10^4 – 6^4)(30^4 – 18^4) = 78336^2
(15^4 – 9^4)(20^4 – 12^4) = 78336^2
(11^4 – 2^4)(27^4 – 18^4) = 78975^2
(15^4 – 10^4)(21^4 – 14^4) = 79625^2
(12^4 – 5^4)(24^4 – 10^4) = 80444^2
(12^4 – 4^4)(24^4 – 8^4) = 81920^2
(12^4 – 3^4)(24^4 – 6^4) = 82620^2
(12^4 – 2^4)(24^4 – 4^4) = 82880^2
(12^4 – 1^4)(24^4 – 2^4) = 82940^2
(15^4 – 12^4)(25^4 – 20^4) = 83025^2
(14^4 – 6^4)(21^4 – 9^4) = 83520^2
(12^4 – 8^4)(27^4 – 18^4) = 84240^2
(10^4 – 5^4)(30^4 – 15^4) = 84375^2
(14^4 – 4^4)(21^4 – 6^4) = 85860^2
(14^4 – 2^4)(21^4 – 3^4) = 86400^2
(10^4 – 4^4)(30^4 – 12^4) = 87696^2
(15^4 – 6^4)(20^4 – 8^4) = 87696^2
(13^4 – 9^4)(26^4 – 18^4) = 88000^2
(15^4 – 13^4)(30^4 – 26^4) = 88256^2
(18^4 – 16^4)(27^4 – 24^4) = 88740^2
(14^4 – 7^4)(22^4 – 11^4) = 88935^2
(21^4 – 20^4)(25^4 – 20^4) = 89175^2
(10^4 – 3^4)(30^4 – 9^4) = 89271^2
(10^4 – 2^4)(30^4 – 6^4) = 89856^2
(15^4 – 3^4)(20^4 – 4^4) = 89856^2
(10^4 – 1^4)(30^4 – 3^4) = 89991^2
(12^4 – 6^4)(26^4 – 13^4) = 91260^2
(14^4 – 11^4)(28^4 – 22^4) = 95100^2
(16^4 – 8^4)(20^4 – 10^4) = 96000^2
(18^4 – 15^4)(24^4 – 20^4) = 96624^2
(11^4 – 2^4)(30^4 – 20^4) = 97500^2
(22^4 – 4^4)(15^4 – 10^4) = 97500^2
(13^4 – 8^4)(26^4 – 16^4) = 97860^2
(15^4 – 5^4)(21^4 – 7^4) = 98000^2
(14^4 – 7^4)(23^4 – 7^4) = 99960^2
(16^4 – 12^4)(24^4 – 18^4) = 100800^2
(18^4 – 14^4)(21^4 – 14^4) = 101920^2
(16^4 – 4^4)(20^4 – 5^4) = 102000^2
(12^4 – 4^4)(27^4 – 9^4) = 103680^2
(12^4 – 8^4)(30^4 – 20^4) = 104000^2
(15^4 – 10^4)(24^4 – 16^4) = 104000^2
(13^4 – 7^4)(26^4 – 14^4) = 104640^2
(12^4 – 6^4)(28^4 – 14^4) = 105840^2
(14^4 – 7^4)(24^4 – 12^4) = 105840^2
(13^4 – 6^4)(26^4 – 12^4) = 109060^2
(13^4 – 5^4)(26^4 – 10^4) = 111744^2
(12^4 – 3^4)(28^4 – 7^4) = 112455^2
(13^4 – 4^4)(26^4 – 8^4) = 113220^2
(14^4 – 10^4)(28^4 – 20^4) = 113664^2
(13^4 – 3^4)(26^4 – 6^4) = 113920^2
(13^4 – 2^4)(26^4 – 4^4) = 114180^2
(13^4 – 1^4)(26^4 – 2^4) = 114240^2
(18^4 – 12^4)(21^4 – 14^4) = 114660^2
(16^4 – 8^4)(22^4 – 11^4) = 116160^2
(15^4 – 10^4)(27^4 – 21^4) = 117000^2
(15^4 – 12^4)(30^4 – 24^4) = 119556^2
(12^4 – 6^4)(30^4 – 15^4) = 121500^2
(18^4 – 9^4)(20^4 – 10^4) = 121500^2
(15^4 – 9^4)(25^4 – 15^4) = 122400^2
(20^4 – 18^4)(30^4 – 27^4) = 123804^2
(14^4 – 7^4)(26^4 – 13^4) = 124215^2
(22^4 – 4^4)(18^4 – 14^4) = 124800^2
(16^4 – 10^4)(24^4 – 15^4) = 124956^2
(17^4 – 1^4)(21^4 – 9^4) = 125280^2
(14^4 – 9^4)(28^4 – 18^4) = 127420^2
(12^4 – 4^4)(30^4 – 10^4) = 128000^2
(15^4 – 5^4)(24^4 – 8^4) = 128000^2
(21^4 – 20^4)(30^4 – 24^4) = 128412^2
(12^4 – 2^4)(30^4 – 5^4) = 129500^2
(23^4 – 7^4)(16^4 – 8^4) = 130560^2
(15^4 – 10^4)(27^4 – 18^4) = 131625^2
(18^4 – 14^4)(24^4 – 16^4) = 133120^2
(15^4 – 6^4)(25^4 – 10^4) = 137025^2
(16^4 – 12^4)(28^4 – 21^4) = 137200^2
(14^4 – 8^4)(28^4 – 16^4) = 137280^2
(16^4 – 8^4)(24^4 – 12^4) = 138240^2
(15^4 – 3^4)(25^4 – 5^4) = 140400^2
(22^4 – 4^4)(18^4 – 12^4) = 140400^2
(18^4 – 6^4)(21^4 – 7^4) = 141120^2
(15^4 – 11^4)(30^4 – 22^4) = 143936^2
(14^4 – 7^4)(28^4 – 14^4) = 144060^2
(16^4 – 6^4)(24^4 – 9^4) = 144540^2
(16^4 – 4^4)(24^4 – 6^4) = 146880^2
(18^4 – 9^4)(22^4 – 11^4) = 147015^2
(16^4 – 2^4)(24^4 – 3^4) = 147420^2
(20^4 – 16^4)(25^4 – 20^4) = 147600^2
(14^4 – 6^4)(28^4 – 12^4) = 148480^2
(18^4 – 12^4)(24^4 – 16^4) = 149760^2
(18^4 – 14^4)(27^4 – 21^4) = 149760^2
(18^4 – 15^4)(30^4 – 25^4) = 150975^2
(14^4 – 5^4)(28^4 – 10^4) = 151164^2
(14^4 – 4^4)(28^4 – 8^4) = 152640^2
(14^4 – 3^4)(28^4 – 6^4) = 153340^2
(14^4 – 2^4)(28^4 – 4^4) = 153600^2
(14^4 – 1^4)(28^4 – 2^4) = 153660^2
(20^4 – 15^4)(24^4 – 18^4) = 157500^2
(21^4 – 18^4)(28^4 – 24^4) = 159120^2
(15^4 – 5^4)(27^4 – 9^4) = 162000^2
(16^4 – 8^4)(26^4 – 13^4) = 162240^2
(15^4 – 10^4)(30^4 – 20^4) = 162500^2
(23^4 – 7^4)(18^4 – 9^4) = 165240^2
(14^4 – 7^4)(30^4 – 15^4) = 165375^2
(18^4 – 12^4)(27^4 – 21^4) = 168480^2
(18^4 – 14^4)(27^4 – 18^4) = 168480^2
(18^4 – 9^4)(24^4 – 12^4) = 174960^2
(15^4 – 9^4)(30^4 – 18^4) = 176256^2
(20^4 – 10^4)(22^4 – 11^4) = 181500^2
(18^4 – 6^4)(24^4 – 8^4) = 184320^2
(15^4 – 8^4)(30^4 – 16^4) = 186116^2
(18^4 – 3^4)(24^4 – 4^4) = 186480^2
(16^4 – 8^4)(28^4 – 14^4) = 188160^2
(18^4 – 12^4)(27^4 – 18^4) = 189540^2
(22^4 – 4^4)(21^4 – 14^4) = 191100^2
(15^4 – 7^4)(30^4 – 14^4) = 192896^2
(15^4 – 6^4)(30^4 – 12^4) = 197316^2
(16^4 – 4^4)(28^4 – 7^4) = 199920^2
(15^4 – 5^4)(30^4 – 10^4) = 200000^2
(15^4 – 4^4)(30^4 – 8^4) = 201476^2
(15^4 – 3^4)(30^4 – 6^4) = 202176^2
(15^4 – 2^4)(30^4 – 4^4) = 202436^2
(15^4 – 1^4)(30^4 – 2^4) = 202496^2
(21^4 – 14^4)(24^4 – 16^4) = 203840^2
(23^4 – 7^4)(20^4 – 10^4) = 204000^2
(18^4 – 9^4)(26^4 – 13^4) = 205335^2
(18^4 – 14^4)(30^4 – 20^4) = 208000^2
(20^4 – 16^4)(30^4 – 24^4) = 212544^2
(18^4 – 10^4)(27^4 – 15^4) = 213696^2
(20^4 – 15^4)(28^4 – 21^4) = 214375^2
(16^4 – 8^4)(30^4 – 15^4) = 216000^2
(20^4 – 10^4)(24^4 – 12^4) = 216000^2
(20^4 – 12^4)(25^4 – 15^4) = 217600^2
(17^4 – 1^4)(28^4 – 12^4) = 222720^2
(18^4 – 8^4)(27^4 – 12^4) = 226980^2
(21^4 – 14^4)(27^4 – 21^4) = 229320^2
(20^4 – 5^4)(24^4 – 6^4) = 229500^2
(17^4 – 9^4)(29^4 – 11^4) = 230880^2
(18^4 – 6^4)(27^4 – 9^4) = 233280^2
(18^4 – 12^4)(30^4 – 20^4) = 234000^2
(18^4 – 4^4)(27^4 – 6^4) = 235620^2
(18^4 – 2^4)(27^4 – 3^4) = 236160^2
(18^4 – 9^4)(28^4 – 14^4) = 238140^2
(20^4 – 8^4)(25^4 – 10^4) = 243600^2
(23^4 – 7^4)(22^4 – 11^4) = 246840^2
(20^4 – 4^4)(25^4 – 5^4) = 249600^2
(22^4 – 4^4)(24^4 – 16^4) = 249600^2
(21^4 – 7^4)(24^4 – 8^4) = 250880^2
(18^4 – 1^4)(28^4 – 10^4) = 251940^2
(20^4 – 10^4)(26^4 – 13^4) = 253500^2
(21^4 – 15^4)(28^4 – 20^4) = 255744^2
(21^4 – 14^4)(27^4 – 18^4) = 257985^2
(22^4 – 11^4)(24^4 – 12^4) = 261360^2
(24^4 – 20^4)(30^4 – 25^4) = 268400^2
(18^4 – 9^4)(30^4 – 15^4) = 273375^2
(20^4 – 14^4)(30^4 – 21^4) = 273564^2
(22^4 – 4^4)(27^4 – 21^4) = 280800^2
(18^4 – 6^4)(30^4 – 10^4) = 288000^2
(18^4 – 3^4)(30^4 – 5^4) = 291375^2
(23^4 – 7^4)(24^4 – 12^4) = 293760^2
(20^4 – 10^4)(28^4 – 14^4) = 294000^2
(24^4 – 16^4)(27^4 – 21^4) = 299520^2
(22^4 – 11^4)(26^4 – 13^4) = 306735^2
(24^4 – 18^4)(28^4 – 21^4) = 308700^2
(21^4 – 12^4)(28^4 – 16^4) = 308880^2
(20^4 – 5^4)(28^4 – 7^4) = 312375^2
(20^4 – 12^4)(30^4 – 18^4) = 313344^2
(22^4 – 4^4)(27^4 – 18^4) = 315900^2
(21^4 – 7^4)(27^4 – 9^4) = 317520^2
(21^4 – 14^4)(30^4 – 20^4) = 318500^2
(25^4 – 20^4)(30^4 – 24^4) = 332100^2
(21^4 – 9^4)(28^4 – 12^4) = 334080^2
(24^4 – 16^4)(27^4 – 18^4) = 336960^2
(20^4 – 10^4)(30^4 – 15^4) = 337500^2
(21^4 – 6^4)(28^4 – 8^4) = 343440^2
(23^4 – 7^4)(26^4 – 13^4) = 344760^2
(21^4 – 3^4)(28^4 – 4^4) = 345600^2
(20^4 – 8^4)(30^4 – 12^4) = 350784^2
(22^4 – 11^4)(28^4 – 14^4) = 355740^2
(20^4 – 6^4)(30^4 – 9^4) = 357084^2
(20^4 – 4^4)(30^4 – 6^4) = 359424^2
(20^4 – 2^4)(30^4 – 3^4) = 359964^2
(24^4 – 12^4)(26^4 – 13^4) = 365040^2
(27^4 – 18^4)(27^4 – 21^4) = 379080^2
(22^4 – 4^4)(30^4 – 20^4) = 390000^2
(21^4 – 7^4)(30^4 – 10^4) = 392000^2
(23^4 – 7^4)(28^4 – 14^4) = 399840^2
(22^4 – 11^4)(30^4 – 15^4) = 408375^2
(24^4 – 8^4)(27^4 – 9^4) = 414720^2
(24^4 – 16^4)(30^4 – 20^4) = 416000^2
(24^4 – 12^4)(28^4 – 14^4) = 423360^2
(24^4 – 6^4)(28^4 – 7^4) = 449820^2
(23^4 – 7^4)(30^4 – 15^4) = 459000^2
(30^4 – 20^4)(27^4 – 21^4) = 468000^2
(24^4 – 12^4)(30^4 – 15^4) = 486000^2
(25^4 – 15^4)(30^4 – 18^4) = 489600^2
(26^4 – 13^4)(28^4 – 14^4) = 496860^2
(24^4 – 8^4)(30^4 – 10^4) = 512000^2
(24^4 – 4^4)(30^4 – 5^4) = 518000^2
(27^4 – 18^4)(30^4 – 20^4) = 526500^2
(25^4 – 10^4)(30^4 – 12^4) = 548100^2
(25^4 – 5^4)(30^4 – 6^4) = 561600^2
(26^4 – 13^4)(30^4 – 15^4) = 570375^2
(27^4 – 9^4)(30^4 – 10^4) = 648000^2
(28^4 – 14^4)(30^4 – 15^4) = 661500^2

Paul.