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Search: id:A069130
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| A069130 |
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Centered 17-gonal numbers. |
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+0
6
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| 1, 18, 52, 103, 171, 256, 358, 477, 613, 766, 936, 1123, 1327, 1548, 1786, 2041, 2313, 2602, 2908, 3231, 3571, 3928, 4302, 4693, 5101, 5526, 5968, 6427, 6903, 7396
(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) = (17n^2 -!7n + 2)/2.
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EXAMPLE
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a(5) = 171 because (17*5^2 - 17*5 + 2)/2 = (425 - 85 + 2)/2 = 342/2 = 171.
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CROSSREFS
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Cf. A005448, A001844, A005891, A003215, A069099.
Sequence in context: A092068 A093520 A051870 this_sequence A124711 A126372 A133356
Adjacent sequences: A069127 A069128 A069129 this_sequence A069131 A069132 A069133
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KEYWORD
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easy,nice,nonn
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AUTHOR
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Terrel Trotter, Jr. (ttrotter(AT)telesal.net), Apr 07 2002
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