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A153817
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a(n)=Sum_{k=1..n} floor((n*k)/(n+k))
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3
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0, 1, 2, 4, 6, 10, 13, 18, 22, 28, 33, 42, 48, 57, 65, 74, 83, 95, 105, 118, 130, 142, 155, 171, 185, 200, 216, 232, 248, 270, 286, 307, 325, 345, 365, 390, 409, 433, 454, 480, 502, 532, 555, 583, 610, 636, 665, 695, 723, 753, 784, 814, 847, 880, 913, 947, 981
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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MAPLE
| A153817 := proc(n) add(floor(n*k/(n+k)), k=1..n) ; end: seq(A153817(n), n=1..100) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 21 2009]
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CROSSREFS
| Cf. A006218, A000005, A153818, A118014
Sequence in context: A094960 A032396 A087148 * A140652 A007981 A075574
Adjacent sequences: A153814 A153815 A153816 * A153818 A153819 A153820
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KEYWORD
| easy,nonn
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AUTHOR
| Ctibor O. Zizka (c.zizka(AT)email.cz), Jan 02 2009
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 21 2009
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