29

This number is a prime.

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29 is only known number m such that both m!-Rm and m!+Rm are primes. I.e., 29! - 111...1 (29 ones) and 29! + 111...1 (29 ones) are both primes. [Firoozbakht]

Submitted: 2004-07-27 00:45:47;   Last Modified: 2012-04-01 07:40:19.
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