10011111122113

This number is a prime.

                                                             1001 1111122113

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The only prime less than a googol formed by concatenating alternately the first n double-digit numbers and their reversals, i.e., 10, 01, 11, 11, 12, 21, 13. [Loungrides]

Submitted: 2017-04-20 11:16:08;   Last Modified: 2018-03-07 20:58:32.
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