Every palindrome with an even number of digits is divisible by 11 (in base 9) and therefore is composite (not prime). Hence there is no palindromic prime with an even number of digits.
Table of n, a(n) for n=1..8.
Eric Weisstein: Palindromic Prime.
Cf. A029977, A117703.
Sequence in context: A101407 A294245 A117785 * A113727 A214141 A193961
Adjacent sequences: A117784 A117785 A117786 * A117788 A117789 A117790
Martin Renner, Apr 15 2006