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A054969 Palindromic hexagonal numbers. 5
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 (list; graph; refs; listen; history; text; internal format)
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

Cf. A000384, 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

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Last modified October 14 07:31 EDT 2019. Contains 327995 sequences. (Running on oeis4.)