13331

This number is a prime.

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The largest prime formed by inserting d identical digits d, between two identical digits n, (d=3, n=1). Note that there are only two other such primes; 313 and 919. [Loungrides]

Submitted: 2015-03-17 10:19:58;   Last Modified: 2015-04-27 00:58:56.
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