Every palindrome with an even number of digits is divisible by 11 (in base 3) 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..14.
Eric Weisstein: Palindromic Prime.
Cf. A029971, A117698.
Sequence in context: A200905 A280510 A292128 * A243307 A021301 A016652
Adjacent sequences: A117772 A117773 A117774 * A117776 A117777 A117778
Martin Renner, Apr 15 2006