Prime Curios!: 83

83
(another Prime Pages' Curiosity)

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83 is the only known number m greater than one such that both numbers (m-1)!*m!*(m+1)!*prime(m) - 1 and (m-1)!*m!*(m+1)!*prime(m) + 1 are primes. [Firoozbakht]

Submitted: 2004-10-31 10:41:33; Last Modified: 2009-08-28 20:38:21.