83

This number is a prime.

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The only prime of form 3^x+5^x+7^x, where x is prime, (case x=2). Note that every other number of the same form, for x a prime, ends with 5. [Loungrides]

Submitted: 2012-02-03 14:33:07; Last Modified: 2019-01-28 12:39:55.