1,1

Every palindrome with an even number of digits is divisible by 11 (in base 6) and therefore is composite (not prime). Hence there is only one palindromic prime with an even number of digits.

Eric Weisstein: Palindromic Prime.

Cf. A029974, A117701.

Sequence in context: A011002 A113817 A083238 this_sequence A116609 A124846 A099512

Adjacent sequences: A117779 A117780 A117781 this_sequence A117783 A117784 A117785

nonn

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