5111723

This number is a prime.

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The concatenation of the only quadruplet of primes starting with 5 and forming an arithmetic progression: p, p + 6, p + 6 + 6, p + 6 + 6 + 6. [Green]

Submitted: 2009-12-11 05:32:05; Last Modified: 2009-12-11 13:16:38.