10-digit number:
1234567891 is a prime number.
20-digit number:
12345678901234567891 is a prime number.
25-digit number:
1234567890000001234567891 is a prime number.
39-digit number:
123456789000000000000000000001234567891 is a prime number.
39-digit number:
123456789123456789123456789001234567891 is a prime number.
101 is a prime number.
120121 is a prime number.
12301231 is a prime number.
1234012341 = 3 * 2803 * 146749
123450123451 = 37 * 28393 * 117511
12345601234561 = 7 * 1763657319223 is a semiprime
1234567012345671 = 3 * 411522337448557 is a semiprime
123456780123456781 = 89 * 1387154832847829 is a semiprime
1013 is a prime number.
1019 is a prime number.
987654320987654323 is a prime number.
Find other primes with the same pattern
This is cool, how did you come up with these?
I was just playing around with long strings with numbers.