2

This number is a prime.

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"Check this out. The second derivative of e^x is e^x, right? And e^x 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 18:45:44; Last Modified: 2009-09-26 19:14:31.