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Search: id:A054971
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A054971 n(5n-3)/2 is a palindromic heptagonal number. +0
3
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; listen)
OFFSET

1,2
LINKS

P. De Geest, Palindromic Heptagonals

CROSSREFS

Cf. A054910, A000566.

Sequence in context: A139022 A053683 A082085 this_sequence A124720 A076958 A163825

Adjacent sequences: A054968 A054969 A054970 this_sequence A054972 A054973 A054974

KEYWORD

nonn,base

AUTHOR

Jeffrey Heleen (meriadoc(AT)cheshire.net), May 26 2000

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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