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From: mdpl@allegra.UUCP (Mary Diane Palmer Leland)
Newsgroups: net.math
Subject: Re: palindromic primes
Message-ID: <2902@allegra.UUCP>
Date: Wed, 14-Nov-84 16:59:42 EST
Article-I.D.: allegra.2902
Posted: Wed Nov 14 16:59:42 1984
Date-Received: Thu, 15-Nov-84 03:32:59 EST
Distribution: net.math
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 8

100656001 is a prime with 9 digits, so the conjecture
that the number of digits in a palindromic prime is prime
is false.  However, it is easy to show that any palindromic
number with an even number of digits is a multiple of 11.
Thus, 11 is the only palindromic prime with an even number of
digits.
					Mary Leland
					AT&T Bell Labs