40898...00001 (867-digits)

This number is a prime.

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The smallest prime number that can be written as 2a^2+1, or 3b^3+1 or 5c^5+1 or 7d^7+1. [Hartley]

Submitted: 2003-02-19 06:32:19; Last Modified: 2008-01-30 17:28:00.