97

This number is a prime.

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97, 907, 9007, 90007 and 900007 are all primes, but 9000007, 90000007, 900000007, 9000000007, and 90000000007 are all composites.

Submitted: 2003-12-19 23:40:49; Last Modified: 2008-07-03 13:50:31.