347

This number is a prime.

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(347, 743) is the first pair of emirps (p, q) such that 5^p and 5^q are both "apocalyptic numbers", i.e., numbers that contain the beast number. [Loungrides]

Submitted: 2013-11-23 17:23:07; Last Modified: 2019-03-18 11:35:17.