17

This number is a prime.

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17 is the largest number less than a thousand such that the sum of its factorial and primorial plus and minus one are primes. I.e., 17!+17#-1 and 17!+17#+1 are primes. [Opao]

Submitted: 2003-11-07 09:33:46; Last Modified: 2008-01-30 17:28:00.