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A054970 Index numbers for palindromic hexagonal numbers. 3
0, 1, 2, 6, 39, 55, 87, 182, 556, 644, 797, 917, 1593, 1685, 25141, 51425, 55556, 83527, 810311, 1620213, 1853942, 5555556, 17352586, 17835196, 25004441, 91071921, 170563673, 181737182, 184252876, 507354403, 1240058219, 1783816196, 2756800387 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A000384, A054969, A082721.

Sequence in context: A072191 A118324 A060421 * A211348 A295912 A120492

Adjacent sequences:  A054967 A054968 A054969 * A054971 A054972 A054973

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 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)