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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