11

This number is a prime.

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2^^n-9 = 2^(2^(2^...(2^2)..))-9 is divisible by 11 for all sufficiently large n. 11 is the largest prime less than a million of which this is true. [Hartley]

Submitted: 2003-04-07 04:15:07;   Last Modified: 2008-01-30 11:28:00.
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