31

This number is a prime.

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31#/2 +/- 2 are the fourth and largest known (as of 2020) "cousin primes" of the type p#/2 +/- 2. (100280245063 and 100280245067). The other three pairs occur for p = 5, 7 and 13. [Rivera]

Submitted: 2020-05-28 11:29:56; Last Modified: 2020-06-14 14:36:32.