7

This number is a prime.

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1! + 2! + 3! + 4! + 5! = 6 (mod 7). It is the largest known prime (up to 10^5) with this property. [Firoozbakht]

Submitted: 2009-11-13 20:58:12;   Last Modified: 2009-11-14 00:49:19.
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