613

This number is a prime.

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613 is a mathematical enigma in the bewildering story Number of the End by Jason Earls. "Bring the first digit back to get 136, it's triangular. Now bring the first digit of that back to get 361, it's a square."

Submitted: 2005-09-13 01:02:24; Last Modified: 2009-03-12 20:10:25.