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 12:26:52;   Last Modified: 2018-12-24 08:28:27.
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