19998991

This number is a prime.

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p = 19998989 and q = 19998991 are a pair of twin primes such that p^n and q^n both start with the digits of n for n = 404, 414, 424, 434, 444 and 454. [Hartley]

Submitted: 2002-12-18 01:43:56; Last Modified: 2016-06-21 21:28:57.