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A128438
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a(n) = floor((denominator of H(n))/n), where H(n) = sum{k=1 to n} 1/k, the n-th harmonic number.
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2
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1, 1, 2, 3, 12, 3, 20, 35, 280, 252, 2520, 2310, 27720, 25740, 24024, 45045, 720720, 226893, 4084080, 775975, 246341, 235144, 5173168, 14872858, 356948592, 343219800, 2974571600, 2868336900, 80313433200, 77636318760, 2329089562800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| This is very similar to A027611, which is a different sequence. - N. J. A. Sloane (njas(AT)research.att.com), Nov 21 2008
Indices where a(n) differs from A027611 are terms of A074791. [From Gary Detlefs, Sep 03 2011]
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EXAMPLE
| The sequence denom(H(n))/n begins 1, 1, 2, 3, 12, 10/3, 20, 35, 280, 252, 2520, 2310, ..., so the present sequence begins 1, 1, 2, 3, 12, 3, 20, 35, 280, 252, 2520, 2310, ...
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MAPLE
| H:=n->sum(1/k, k=1..n): a:=n->floor(denom(H(n))/n): seq(a(n), n=1..34); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 25 2007
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CROSSREFS
| Cf. A128437, A002805, A027611.
Sequence in context: A140970 A058523 A103782 * A162846 A072734 A046207
Adjacent sequences: A128435 A128436 A128437 * A128439 A128440 A128441
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Mar 03 2007
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 25 2007
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