67
This number is a prime.
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The only double-digit prime ab such that p^b+[R(p)]^a is prime, where R(p) is the reversal of p, i.e., 67^7+76^6 = 6253411533899. [Loungrides]
Submitted: 2016-01-24 18:26:52; Last Modified: 2018-12-24 14:28:27.
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