3449
This number is a prime.
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2^^n-5 = 2^(2^(2^...(2^2)..))-5 is divisible by 3449 for all sufficiently large n. 3449 is the only prime less than a million for which this is true. [Hartley]
Submitted: 2003-04-07 09:09:36; Last Modified: 2008-01-30 17:28:00.
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