2

This number is a prime.

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The only known prime x such that 2^x+3^x, 2^x+5^x, 2^x+7^x are all primes, i.e., 13, 29, 53. [Loungrides]

Submitted: 2018-03-12 19:27:09; Last Modified: 2018-04-03 11:39:40.