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This prime was obtained by summing all of the divisors of 20^20 after reversing them. Let srd(n) denote the sum of the reversed divisors of n. When n=2, 20, and 22, srd(n^n) is prime, with no more values known. [Earls]


  Submitted: 2005-05-02 10:47:54;   Last Modified: 2008-01-30 11:28:00.

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