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A062712 Numbers that are n-gons for three or more n's, where n=3,4,5,...,16. 3
1, 15, 36, 45, 325, 561, 1225, 1540, 3025, 4186, 11781, 40755, 41041, 58311, 121771, 221445, 1334161, 1413721, 1777555, 3000025, 5785101, 27169506, 36855405, 113123361, 321197185, 1167483681, 1533776805, 1631432881 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
Albert H. Beiler, Recreations in the Theory of Numbers: The Queen of Mathematics Entertains 185-99 (2d ed. 1966)
LINKS
Eric Weisstein's World of Mathematics, Polygonal Number
EXAMPLE
45 is a triangular, hexagonal and hexadecagonal number
MATHEMATICA
Select[Tally[Flatten[Table[PolygonalNumber[b, Range[10^6]], {b, 3, 16}]]], #[[2]]>2&][[;; , 1]]//Union (* Harvey P. Dale, Aug 26 2023 *)
CROSSREFS
Sequence in context: A219096 A365905 A134509 * A224719 A033709 A067707
KEYWORD
nonn
AUTHOR
Harvey P. Dale, Jul 14 2001
EXTENSIONS
More terms from Eric W. Weisstein, Nov 30, 2003.
STATUS
approved

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Last modified March 29 09:42 EDT 2024. Contains 371268 sequences. (Running on oeis4.)