A057107 Octagonal palindromes.

0, 1, 8, 8008, 120232021, 124060421, 161656161, 185464581, 544721127445, 616947749616, 3333169613333, 3333802083333, 6506939396056, 12212500521221, 5466543663456645, 3310988011108890133, 520752145595541257025, 336753352502205253357633

Offset: 1

Author

Patrick De Geest, Aug 15 2000

Keywords

• nonn
• base

Links

• Robert Price, Table of n, a(n) for n = 1..23
• P. De Geest, Palindromic Octagonals

Crossrefs

Cf. A057106, A000567.

Programs

Mathematica

Select[PolygonalNumber[8, Range[0, 10^5]], PalindromeQ] (* Robert Price, Apr 29 2019 *)

Extensions

a(1)=0 added by Robert Price, Apr 29 2019