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Search: id:A070889
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| A070889 |
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Denominator of Sum_{k=1..n} mu(k)/k. |
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+0
4
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| 1, 2, 6, 6, 30, 15, 105, 105, 105, 210, 2310, 2310, 30030, 15015, 5005, 5005, 85085, 85085, 1616615, 1616615, 4849845, 9699690, 223092870, 223092870, 223092870, 111546435, 111546435, 111546435, 3234846615, 2156564410, 66853496710
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(6)=15 because 1-1/2-1/3-1/5+1/6 = 4/30=2/15.
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MATHEMATICA
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Table[ Denominator[ Sum[ MoebiusMu[k]/k, {k, 1, n}]], {n, 1, 37}]
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PROGRAM
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PARI: t = 0; v = []; for( n = 1, 30, t = t + mu( n) / n; v = concat( v, denom( t))); v
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CROSSREFS
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Cf. A070888.
Sequence in context: A068629 A144361 A163641 this_sequence A072744 A056042 A056040
Adjacent sequences: A070886 A070887 A070888 this_sequence A070890 A070891 A070892
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KEYWORD
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frac,nonn,easy
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AUTHOR
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Donald S McDonald (don.mcdonald(AT)paradise.net.nz), May 17 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 10 2002
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