15

This number is a composite.

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The only known natural number n > 0 such that the sum of the five known Fermat primes raised to the power n is prime. Curiously, it is the product of the first two Fermat primes. [Capelle]

Submitted: 2009-06-01 08:19:21;   Last Modified: 2009-06-01 15:29:52.
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