1,1

Every palindrome with an even number of digits is divisible by 11 (in base 5) 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..28.

Eric Weisstein: Palindromic Prime.

Cf. A029973, A117700.

Sequence in context: A260330 A094032 A261044 * A155759 A202209 A201730

Adjacent sequences: A117777 A117778 A117779 * A117781 A117782 A117783

nonn,base

Martin Renner, Apr 15 2006

a(11)-a(28) from Chai Wah Wu, Dec 27 2015

approved