158

This number is a composite.

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75*158^75+1 and 76*158^76+1 are both prime. However, neither 75*a^75+1 nor 76*a^76+1 are prime for any smaller a! [Hartley]

Submitted: 2006-10-25 03:39:01; Last Modified: 2008-01-30 17:28:00.