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A054971 n(5n-3)/2 is a palindromic heptagonal number. 2
1, 2, 5, 16, 38, 44, 156, 583, 1359, 1470, 1556, 53537, 158476, 161656, 171657, 190914, 371778, 382173, 615769, 1207698, 1686537, 16943262, 88274141, 496329416, 765609041, 1820198063, 2497949426, 2850685772, 15911875336 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

P. De Geest, Palindromic Heptagonals

CROSSREFS

Cf. A054910, A000566.

Sequence in context: A305876 A082085 A179992 * A124720 A188947 A076958

Adjacent sequences:  A054968 A054969 A054970 * A054972 A054973 A054974

KEYWORD

nonn,base

AUTHOR

Jeff Heleen, May 26 2000

STATUS

approved

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Last modified September 23 06:51 EDT 2018. Contains 315273 sequences. (Running on oeis4.)