12508...40031 (19893-digits)

This number is a prime.

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17763*2^66066-1 is prime. Note that 66066 is a palindromic triangular number, and that 1^2+7^2+7^2+6^2+3^2 = 6^2+6^2+0^2+6^2+6^2 = 144 = 12^2. [Earls]

Submitted: 2004-09-10 18:47:38; Last Modified: 2008-01-30 17:28:00.