# 191

This number is a prime.

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(191, 251) is the only pair of 3-digit primes that can be
represented as the product of two consecutive primes minus
their sum, and to the product of the same primes plus their
sum, 13*17 - (13+17) = 191, 13*17 + (13+17) = 251. Note
that the concatenations in both orders of the elements of
this pair, i.e., 191251 and 251191 are both primes. [Loungrides]
Submitted: 2019-01-31 10:17:31; Last Modified: 2019-01-31 13:04:33.

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