37

This number is a prime.

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The smallest positive integer that is never prime when followed by a string of ones, i.e., 371, 3711, 37111, 371111, ... are all composite numbers for any number of ones. [Gaydos]

Submitted: 2016-06-25 08:40:38;   Last Modified: 2016-08-14 16:50:01.
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