15
This number is a composite.
Just showing those entries submitted by 'Wesolowski': (Click here to show all)
(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]
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