1112131

This number is a prime.

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The only prime less than a googol formed by concatenating in ascending order the first n consecutive numbers ending with 1, (case n=4), i.e., 1, 11, 21, 31. [Loungrides]

Submitted: 2013-08-08 10:04:33; Last Modified: 2017-12-31 17:22:36.