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Search: id:A109922
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| A109922 |
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Floor(lcm(1,2,...n)/(1+2+...+n)). |
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+0
2
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| 1, 0, 1, 1, 4, 2, 15, 23, 56, 45, 420, 355, 3960, 3432, 3003, 5299, 80080, 71650, 1225224, 1108536, 1007760, 920128, 19399380, 17847429, 82372752, 76271066, 212469400, 197816337, 5354228880, 5008794758, 145568097675, 273491577450
(list; graph; listen)
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OFFSET
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1,5
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EXAMPLE
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a(6)=2 because floor(lcm(1,2,3,4,5,6)/(1+2+3+4+5+6))=floor(60/21)=2.
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MAPLE
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a:=n->floor(2*lcm(seq(k, k=1..n))/n/(n+1)): seq(a(n), n=1..37); (Deutsch)
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MATHEMATICA
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f[n_] := Floor[ 2LCM @@ Range[n]/(n(n + 1))]; Table[ f[n], {n, 32}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 18 2005)
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CROSSREFS
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Sequence in context: A019061 A121662 A130042 this_sequence A090640 A090881 A110485
Adjacent sequences: A109919 A109920 A109921 this_sequence A109923 A109924 A109925
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 16 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu) and Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 16 2005
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