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#15 by Giovanni Resta at Thu May 07 06:16:06 EDT 2020
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#14 by Joerg Arndt at Thu May 07 04:32:03 EDT 2020
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#13 by Michel Marcus at Thu May 07 00:42:30 EDT 2020
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#12 by Michel Marcus at Thu May 07 00:42:11 EDT 2020
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| PROG
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(PARI) a(n) = denominator(sum(k=1, n, 1/k^3)/sum(k=1, n, 1/k)); \\ Michel Marcus, May 07 2020
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| STATUS
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proposed
editing
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#11 by Petros Hadjicostas at Wed May 06 19:09:52 EDT 2020
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#10 by Petros Hadjicostas at Wed May 06 19:09:12 EDT 2020
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#9 by Petros Hadjicostas at Wed May 06 19:08:31 EDT 2020
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#8 by Petros Hadjicostas at Wed May 06 18:47:29 EDT 2020
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| MAPLE
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a := proc(n) local i: denom(add(1/i^3, i = 1 .. n))/denom(add(1/i, i = 1 .. n)): end proc:
seq(a(n), n=1..30); # Petros Hadjicostas, May 06 2020
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#7 by Petros Hadjicostas at Wed May 06 18:38:13 EDT 2020
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#6 by Petros Hadjicostas at Wed May 06 18:37:19 EDT 2020
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| NAME
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Denominator(sum(Sum_{i=1,..n,} 1/i^3))/)/denominator(sum(Sum_{i=1,..n,} 1/i)).).
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| FORMULA
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a(n)=) = A007409(n)/A002805(n)).
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| CROSSREFS
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Cf. A002805, A007409.
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| STATUS
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approved
editing
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