43

This number is a prime.

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The only double-digit prime p such that (p!/(R(p))-1 is prime, i.e., (43!/34!)-1 = 204636013545599. [Patterson and Loungrides]

Submitted: 2020-02-24 13:41:06;   Last Modified: 2020-06-14 09:28:05.
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