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A054910 Palindromic heptagonal numbers (A000566). 2
1, 7, 55, 616, 3553, 4774, 60606, 848848, 4615164, 5400045, 6050506, 7165445617, 62786368726, 65331413356, 73665056637, 91120102119, 345546645543, 365139931563, 947927729749, 3646334336463, 7111015101117, 717685292586717 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..22.

P. De Geest, Palindromic Heptagonals

CROSSREFS

Cf. A054971, A000566.

Sequence in context: A083836 A159313 A318580 * A028562 A209668 A180829

Adjacent sequences:  A054907 A054908 A054909 * A054911 A054912 A054913

KEYWORD

nonn,base

AUTHOR

Jeff Heleen, May 26 2000

STATUS

approved

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Last modified September 23 05:43 EDT 2018. Contains 315273 sequences. (Running on oeis4.)