1,1

Every palindrome with an even number of digits is divisible by 11 (in base 8) and therefore is composite (not prime). Hence there is no palindromic prime with an even number of digits.

Eric Weisstein: Palindromic Prime.

Cf. A029976, A006341.

Sequence in context: A002978 A056460 A137523 this_sequence A117788 A006710 A081162

Adjacent sequences: A117783 A117784 A117785 this_sequence A117787 A117788 A117789

nonn

Martin Renner (martin.renner(AT)gmx.net), Apr 15 2006