181

This number is a prime.

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The smaller prime in the first multidigit "Gridgeman pair." A Gridgeman pair is two palindromic primes, which differ only in that their middle digits are x and x + 1 respectively. These are named in honor of Norman T. Gridgeman (1912-1995) who conjectured that there are an infinite number of primes in this form. [King]

Submitted: 2004-04-08 22:16:49; Last Modified: 2009-09-06 18:52:45.