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Search: id:A161320
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| A161320 |
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Floor of Sum(2Cos[I*Pi*i/(2j)]-1),j=1,k; i=1,j; k = 1,2,3,... |
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+0
1
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| 4, 9, 17, 26, 37, 51, 66, 83, 102, 122, 145, 170, 197, 225, 256, 288, 323, 359
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Sequence appears to oscillate near {n^2} for n= 2,3,4,...
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MATHEMATICA
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Floor[N[Table[Sum[(2*Cos[Pi*I*i/(2j)]-1), {j, 1, k}, {i, 1, j}], {k, 1, 20}]]]
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CROSSREFS
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Sequence in context: A110979 A073173 A092464 this_sequence A134578 A009851 A026403
Adjacent sequences: A161317 A161318 A161319 this_sequence A161321 A161322 A161323
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KEYWORD
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nonn,uned
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AUTHOR
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Daniel Tisdale (daniel6874(AT)gmail.com), Jun 06 2009
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