1,1

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.

Eric Weisstein: Palindromic Prime.

Cf. A029977, A117703.

Adjacent sequences: A117785 A117786 A117787 this_sequence A117789 A117790 A117791

Sequence in context: A056460 A137523 A117786 this_sequence A006710 A081162 A095367

nonn

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