13921
This number is a prime.
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]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell