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Search: id:A074638
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| A074638 |
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Denominator of 1/3+1/7+1/11+...+1/(4n-1). |
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+0
4
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| 3, 21, 231, 385, 7315, 168245, 4542615, 140821065, 28164213, 366134769, 15743795067, 739958368149, 12579292258533, 62896461292665, 3710891216267235, 3710891216267235, 248629711489904745
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OFFSET
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1,1
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MATHEMATICA
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Table[ Denominator[ Sum[1/i, {i, 3/4, n}]], {n, 1, 20}]
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CROSSREFS
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The numerators are in A074637.
Cf. A075135.
Sequence in context: A107864 A113663 A082545 this_sequence A097329 A119097 A008545
Adjacent sequences: A074635 A074636 A074637 this_sequence A074639 A074640 A074641
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KEYWORD
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easy,frac,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 27 2002
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