Prime Curios!: 29

29
(another Prime Pages' Curiosity)

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29 is only known number m such that both m!-R(m) and m!+R(m) 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: 2008-01-30 11:28:00.