13118...98657 (5573-digits)
This number is a prime.
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The only known Cullen prime which is also a generalized Fermat prime: 18496*2^18496+1 = 289*2^18502+1 = (17*2^9251)^2+1. [Jeong]
Submitted: 2010-01-20 04:30:21; Last Modified: 2010-01-21 17:19:17.
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