1213

This number is a prime.

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12 and 13 are relatively prime, while 12^2 + 13^2 = 313 (a palindromic prime). Note also that 12^4 + 13^4 = 49297 is prime. [La Haye]

Submitted: 2003-03-12 17:13:54; Last Modified: 2008-01-30 17:28:00.