17171...71771 (38-digits)

This number is a prime.

17171717 1717171717 1717171717 1717171771

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The only prime formed by inserting n n’s between a double-digit number n and its reversal, i.e., seventeen 17’s between 17 and 71. [Loungrides]

Submitted: 2011-01-31 15:58:11; Last Modified: 2017-11-17 01:01:22.