5

This number is a prime.

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n! never ends in 5 zeros. Note that the first 5 terms in the sequence of numbers of zeros that n! never ends in are all prime. The set includes 5, 11, 17, 23, and 29.

Submitted: 1999-09-02 23:40:00; Last Modified: 2008-03-30 15:45:20.