1223

This number is a prime.

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The larger of only two non-titanic primes p, that is the product of a repunit number and all truncations of itself plus two, i.e., 111*11*1+2. Note that the other such prime, 11*1+2, is also emirp. [Loungrides]

Submitted: 2017-07-20 12:09:43; Last Modified: 2017-07-21 17:47:06.