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A051540
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Least common multiple of {2, 5, 8, 11, 14 ...,(3n+2)} (A016789).
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5
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2, 10, 40, 440, 3080, 52360, 52360, 1204280, 15655640, 454013560, 1816054240, 1816054240, 34505030560, 1414706252960, 1414706252960, 66491193889120, 332455969445600, 17620166380616800, 17620166380616800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Denominator of H(n,3,2), a generalized harmonic number. See A075135.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..100
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EXAMPLE
| a(3) = lcm {2, 5, 8, 11} = 440
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MATHEMATICA
| Table[ Denominator[ Sum[1/i, {i, 2/3, n}]], {n, 1, 20}]
Table[ Apply[ LCM, Join[{1}, Table[2 + 3i, {i, 0, n}]]], {n, 0, 19}]
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PROG
| (MAGMA) k:=56; [Lcm([h: h in [2..j by 3]]): j in [2..k by 3]]; // Bruno Berselli, May 03 2011
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CROSSREFS
| Cf. A016789, A051552. The numerators are in A074597.
Cf. A075135.
Cf. A051536.
Sequence in context: A151028 A080252 A127113 * A125130 A110684 A197175
Adjacent sequences: A051537 A051538 A051539 * A051541 A051542 A051543
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KEYWORD
| easy,frac,nonn
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AUTHOR
| Asher Auel (asher.auel(AT)reed.edu)
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EXTENSIONS
| Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 27 2002
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