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A090428 Numbers that are n-gons for two or more n's, where n=3,4,5,...,16. +0
1
1, 6, 9, 10, 12, 15, 16, 21, 28, 36, 45, 55, 64, 66, 70, 81, 91, 105, 120, 145, 153, 171, 176, 190, 196, 210, 225, 231, 276, 280, 325, 378, 400, 435, 441, 477, 496, 540, 561, 595, 616, 630, 651, 703, 715, 780, 833, 861, 936, 946, 1035, 1089, 1105, 1128, 1216 (list; graph; listen)
OFFSET

1,2

LINKS

Eric Weisstein's World of Mathematics, Polygonal Number

CROSSREFS

Cf. A062712.

Sequence in context: A053869 A085275 A090466 this_sequence A039725 A125494 A105066

Adjacent sequences: A090425 A090426 A090427 this_sequence A090429 A090430 A090431

KEYWORD

nonn

AUTHOR

Eric Weisstein (eric(AT)weisstein.com), Nov 30, 2003

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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