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 A^2 = B^3 + C^3
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 smallest integer whose first n multiples all contain a 3
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Monthly Archives: March 2014
Triangle whose sides and area are integers, semiperimeter a square
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x^2 – y^2 = A^3 and x^3 – y^3 = B^2
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Integer triangles, sides form an arithmetical progression
For example, Find others.
Factors of 7*2^n – 1
Related posts: k * 2^n ± 1 Factors of 3 * 2^n – 1, n=1,2,..,100 Factors of 5 * 2^n – 1
Consecutive num3ers that are not divisible by any of their digits
I’m presenting a sequence of consecutive integers which are not divisible by any of their digits: 2digit numbers : 3digit numbers : The first square number in that sequence : The first twin prime … Continue reading
Square Num3ers that end with xyxyxyxyxy
To find the smallest square numbers that end with: 2121212121 2929292929 6969696969 8484848484
Integer n such that n+6 is prime and 9*n + k a square
Find the first few values for n so that n + 6 is a prime number and (9*n + 8), (9*n + 7), (9*n + 6), … (9*n + 1) are … Continue reading