9

This number is a composite.

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10*(22n + 1) + 9 gives primes for n = 1 to 7. Therefore, there are 7 known Fermat numbers which yields primes when a 9 is appended. [Wesolowski]

Submitted: 2009-05-15 14:30:29;   Last Modified: 2011-02-06 13:44:26.
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