A057106 Numbers k such that k(3k-2) is an octagonal palindrome.

0, 1, 2, 52, 6331, 6431, 7341, 7863, 426115, 453486, 1054067, 1054167, 1472746, 2017631, 42687015, 1050553507, 13175129925, 335038979077, 1400295262095, 5847307263801, 51722791547842, 78849864240621, 105802560494387

Offset: 1

Author

Patrick De Geest, Aug 15 2000

Keywords

• nonn
• base

Links

• P. De Geest, Palindromic Octagonals

Crossrefs

Cf. A057107, A000567.

Programs

Mathematica

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

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 17 2008

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