1012345678901

This number is a prime.

101 2345678901

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The only emirp formed by inserting the sequence of positive digits, 1 - 9, between a double-digit number n and its reversal R(n), case (10, 01). [Loungrides]

Submitted: 2014-02-15 14:01:47; Last Modified: 2018-05-09 12:58:03.