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Search: id:A069127
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| A069127 |
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Centered 14-gonal numbers. |
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+0
6
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| 1, 15, 43, 85, 141, 211, 295, 393, 505, 631, 771, 925, 1093, 1275, 1471, 1681, 1905, 2143, 2395, 2661, 2941, 3235, 3543, 3865, 4201, 4551, 4915, 5293, 5685, 6091
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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) = 7n^2 - 7n + 1
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EXAMPLE
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a(5) = 141 because 7*5^2 - 7*5 + 1 = 175 - 35 + 1 = 141
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CROSSREFS
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Cf. A005448, A001844, A005891, A003215, A069099.
Sequence in context: A051867 A008976 A072119 this_sequence A137183 A124708 A126369
Adjacent sequences: A069124 A069125 A069126 this_sequence A069128 A069129 A069130
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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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