23

This number is a prime.

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To get to the next prime after 23, add 2+2+2 to get 29. Change 2+2+2 to 2*2*2 = 8, then 23*8 mod(23+8) = 29. [Bergot]

Submitted: 2022-02-08 00:15:27; Last Modified: 2022-02-08 13:10:51.