31

This number is a prime.

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Steve Homewood from England discovered that the formula 2n^2 + 4n + 31 generates prime numbers over 43 percent of the time for all positive values up to 10 million, thus solving the Alpha31 problem posed by Vasilios Gardiakos.

Submitted: 2009-12-29 11:46:55;   Last Modified: 2011-12-22 07:53:01.
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