This number is a prime.

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M31 = 2^31 - 1 = 0x7FFFFFFF. It also happens to be the largest signed 32-bit integer (available in many programing languages, i.e., C/C++ int on 32-bit platforms). [Zenczykowski]

Submitted: 2003-10-27 20:32:21;   Last Modified: 2014-08-30 15:16:45.
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