1,3

Every palindrome with an even number of digits is divisible by 11 (in base 3) 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..42.

Eric Weisstein: Palindromic Prime.

Cf. A029971, A117698.

Sequence in context: A308218 A067165 A079981 * A298610 A186492 A137448

Adjacent sequences: A117773 A117774 A117775 * A117777 A117778 A117779

nonn,base

Martin Renner, Apr 15 2006

a(15)-a(42) from Chai Wah Wu, Dec 27 2015

approved