A117788 Total number of palindromic primes in base 9 with n digits.

4, 0, 13, 0, 64, 0, 418, 0, 2917, 0, 20839, 0, 157743, 0, 1246700, 0, 9711161, 0, 78020556, 0

Offset

1,1

Comments

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.

Links

Table of n, a(n) for n=1..20.

Eric Weisstein: Palindromic Prime.

Crossrefs

Cf. A029977, A117703.

Sequence in context: A369914 A291108 A117786 * A233398 A006710 A141150

Adjacent sequences: A117785 A117786 A117787 * A117789 A117790 A117791

Keyword

nonn,base

Author

Martin Renner, Apr 15 2006

Extensions

a(9)-a(20) from Chai Wah Wu, Dec 27 2015

Status

approved