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Search: id:A069174
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| A069174 |
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Centered 23-gonal numbers. |
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+0
1
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| 1, 24, 70, 139, 231, 346, 484, 645, 829, 1036, 1266, 1519, 1795, 2094, 2416, 2761, 3129, 3520, 3934, 4371, 4831, 5314, 5820, 6349, 6901, 7476, 8074, 8695, 9339, 10006
(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) = (23n^2 - 23n + 2)/2
a(n)=23*n+a(n-1)-23 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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EXAMPLE
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For n=2, a(2)=23*2+1-23=24; n=3, a(3)=23*3+24-23=70; n=4, a(4)=23*4+70-23=139 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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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: A043934 A087406 A051876 this_sequence A124717 A126378 A006352
Adjacent sequences: A069171 A069172 A069173 this_sequence A069175 A069176 A069177
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KEYWORD
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easy,nonn,new
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AUTHOR
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Terrel Trotter, Jr. (ttrotter(AT)telesal.net), Apr 09 2002
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