151

This number is a prime.

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151 - 1!*5!*1!, 151 + 1!*5!*1!, 151*1!*5!*1! - 1, & 151*1!*5!*1! + 1, are all primes. Note that 151151 has the same property. [Firoozbakht]

Submitted: 2004-07-30 08:36:32;   Last Modified: 2008-01-30 11:28:00.
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