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Search: id:A135585
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| A135585 |
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a(n) = sum_{i=1..n} [floor( S2(i)/3) mod 2], where S2(i) = A000120(i). |
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+0
2
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| 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 4, 5, 5, 5, 5, 6, 6, 7, 8, 9, 9, 10, 11, 12, 13, 14, 15, 16, 16, 16, 16, 17, 17, 18, 19, 20, 20, 21, 22, 23, 24, 25, 26, 27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 41, 41, 41, 41, 42
(list; graph; listen)
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OFFSET
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0,12
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COMMENT
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Sequence A115384 is a(n)=sum_{i=1..n}[floor(S2(n)*1/1]mod 2 = sum_{i=1..n} S2(n) mod 2.
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MAPLE
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A000120 := proc(n) local i ; add(i, i=convert(n, base, 2)) : end: A135585 := proc(n) add(floor(A000120(i)/3) mod 2, i=1..n) ; end: seq(A135585(n), n=0..80) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2008
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CROSSREFS
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Cf. A115384, A010060.
Adjacent sequences: A135582 A135583 A135584 this_sequence A135586 A135587 A135588
Sequence in context: A094457 A022820 A069928 this_sequence A081094 A054633 A072490
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KEYWORD
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easy,nonn
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AUTHOR
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Ctibor O. ZIZKA (ctibor.zizka(AT)seznam.cz), Feb 25 2008
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EXTENSIONS
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Definition corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2008
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