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: A019062 A051460 A101407 this_sequence A117787 A113727 A116561

Adjacent sequences: A117782 A117783 A117784 this_sequence A117786 A117787 A117788

nonn

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