13921

This number is a prime.

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The smallest prime in a set of eight consecutive primes that create four pairs of primes ending respectively with 1, 3, 7, 9, i.e., (13921, 13931), (13933, 13963), (13967, 13997), (13999, 14009). [Loungrides]

Submitted: 2013-01-02 18:14:25; Last Modified: 2020-02-19 12:37:01.