190633

This number is a prime.

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2^^n-7 = 2^(2^(2^...(2^2)..))-7 is divisible by 190633 for all sufficiently large n. 190633 is the only prime (besides 3) less than a million for which this is true. [Hartley]

Submitted: 2003-04-07 09:12:19; Last Modified: 2008-01-30 17:28:00.