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Search: id:A070891
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| A070891 |
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Denominator of Sum_{k=1..n} mu(k)/k when it changes sign. |
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+0
3
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| 30, 15, 105, 210, 2310, 5005, 1616615, 9699690, 223092870, 111546435, 2156564410, 100280245065, 3710369067405, 7420738134810, 6541380665835015
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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PARI: t = 0; v = []; for( n = 1, 80, t1 = t; t = t + mu( n) / n; if( t * t1 < 0, v = concat( v, denom( t)), )); v
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CROSSREFS
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Cf. A070890, A070888, A070889.
Sequence in context: A070657 A089332 A040873 this_sequence A033971 A040872 A117749
Adjacent sequences: A070888 A070889 A070890 this_sequence A070892 A070893 A070894
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KEYWORD
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nonn,frac
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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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