2

This number is a prime.

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"Check this out. The second derivative of ex is ex, right? And ex evaluated at 0 is equal to 1, right? Therefore 2 has got to be a prime number." (from the paper A Curious Way to Test for Primes by Dennis P. Walsh, 2007)

Submitted: 2009-09-26 13:45:44;   Last Modified: 2009-09-26 14:14:31.
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