15

This number is a composite.

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(F015 + F115 + F215 + F315 + F415) and (F015 + F115 + F215 + F315 + F415 + 6) are sexy primes. Note that the first five Fermat numbers are all prime. [Wesolowski]

Submitted: 2007-10-23 19:16:08;   Last Modified: 2008-01-30 11:28:00.
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