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A054910 Palindromic heptagonal numbers. 6
0, 1, 7, 55, 616, 3553, 4774, 60606, 848848, 4615164, 5400045, 6050506, 7165445617, 62786368726, 65331413356, 73665056637, 91120102119, 345546645543, 365139931563, 947927729749, 3646334336463, 7111015101117, 717685292586717, 19480809790808491 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Intersection of A002113 (palindromic) and A000566 (heptagonal).

LINKS

Robert Price, Table of n, a(n) for n = 1..29

P. De Geest, Palindromic Heptagonals

MATHEMATICA

Select[PolygonalNumber[7, Range[0, 10^6]], PalindromeQ] (* Robert Price, Apr 28 2019 *)

CROSSREFS

Cf. A054971, A000566.

Sequence in context: A326885 A159313 A318580 * A028562 A209668 A340028

Adjacent sequences:  A054907 A054908 A054909 * A054911 A054912 A054913

KEYWORD

nonn,base

AUTHOR

Jeff Heleen, May 26 2000

EXTENSIONS

Added a(1)=0 by Robert Price, Apr 28 2019

STATUS

approved

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Last modified November 29 01:40 EST 2021. Contains 349416 sequences. (Running on oeis4.)