23

This number is a prime.

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23 is the smallest prime that has a number of composites before and after it that form a twin prime pair, i.e., 19 (3 composites) 23 (5 composites) 29 and {3, 5} is a set of twin primes. [Honaker]

Submitted: 2020-06-13 03:08:35; Last Modified: 2020-06-13 03:16:55.