7

This number is a prime.

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Patterson's Conjecture: If Pn is the nth prime, then the series (P1-1 + P2-2 + P3-3 + ... + Pn-n) is divisible by Pn if and only if Pn = 7.

Submitted: 2008-10-11 10:56:43;   Last Modified: 2008-10-12 15:57:52.
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