23

This number is a prime.

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Square 23 to get 529, square 529 to get 279841. Notice that the last three digits (841) equals 29^2, providing 29 as the next prime after 23. [Bergot]

Submitted: 2019-06-26 12:17:47;   Last Modified: 2019-06-26 12:39:20.
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