A054969 Palindromic hexagonal numbers.

0, 1, 6, 66, 3003, 5995, 15051, 66066, 617716, 828828, 1269621, 1680861, 5073705, 5676765, 1264114621, 5289009825, 6172882716, 13953435931, 1313207023131, 5250178710525, 6874200024786, 61728399382716, 602224464422206, 636188414881636, 1250444114440521

Offset

1,3

Links

Robert Price, Table of n, a(n) for n = 1..33

Mathematica

Select[PolygonalNumber[6, Range[0, 10^6]], PalindromeQ] (* Robert Price, Apr 27 2019 *)

Crossrefs

Intersection of A000384 and A002113.

Cf. A054970, A082721.

Sequence in context: A259123 A292026 A126459 * A068966 A063039 A082781

Adjacent sequences: A054966 A054967 A054968 * A054970 A054971 A054972

Keyword

nonn,base

Author

Jeff Heleen, May 26 2000

Extensions

Added a(1)=0 by Robert Price, Apr 27 2019

Status

approved