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Search: id:A069173
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| A069173 |
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Centered 22-gonal numbers. |
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+0
1
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| 1, 23, 67, 133, 221, 331, 463, 617, 793, 991, 1211, 1453, 1717, 2003, 2311, 2641, 2993, 3367, 3763, 4181, 4621, 5083, 5567, 6073, 6601, 7151, 7723, 8317, 8933, 9571
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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E. Weisstein, Centered Polygonal Numbers
Index entries for sequences related to centered polygonal numbers
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FORMULA
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a(n) = 11n^2 - 11n + 1
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EXAMPLE
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a(5) = 221 because 11*5^2 - 11*5 + 1 = 275 - 55 + 1 = 221
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CROSSREFS
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Cf. A005448, A001844, A005891, A003215, A069099, A069125, A069133, A069126, A069127, A069128, A069129, A069130, A069131, A069132.
Sequence in context: A030458 A053559 A031376 this_sequence A124716 A139955 A126377
Adjacent sequences: A069170 A069171 A069172 this_sequence A069174 A069175 A069176
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KEYWORD
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easy,nonn
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AUTHOR
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Terrel Trotter, Jr. (ttrotter(AT)telesal.net), Apr 09 2002
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