251

This number is a prime.

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(251, 257, 263, 269) is the smallest sexy prime quadruplet and the only with 3-digit terms), for which there are no other primes between the first and last terms except from its other two terms. [Loungrides]

Submitted: 2017-02-26 08:18:17; Last Modified: 2018-04-07 14:02:08.