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 13:19:21; Last Modified: 2009-06-01 20:29:52.
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