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A099378
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Denominators of the harmonic means of the divisors of the positive integers.
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5
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1, 3, 2, 7, 3, 1, 4, 15, 13, 9, 6, 7, 7, 3, 2, 31, 9, 13, 10, 7, 8, 9, 12, 5, 31, 21, 10, 1, 15, 3, 16, 21, 4, 27, 12, 91, 19, 15, 14, 9, 21, 2, 22, 7, 13, 9, 24, 31, 19, 31, 6, 49, 27, 5, 18, 15, 20, 45, 30, 7, 31, 12, 52, 127, 21, 3, 34, 21, 8, 9, 36, 65, 37, 57, 62, 35, 24, 7, 40, 93
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Eric Weisstein's World of Mathematics, Ore's Conjecture
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EXAMPLE
| 1, 4/3, 3/2, 12/7, 5/3, 2, 7/4, 32/15, ...
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MATHEMATICA
| f[n_] := DivisorSigma[0, n]/Plus @@ (1/Divisors@n); Denominator@ Array[f, 80] [From Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 04 2010]
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CROSSREFS
| Cf. A099377.
Sequence in context: A174238 A175920 A200593 * A182885 A182891 A071190
Adjacent sequences: A099375 A099376 A099377 * A099379 A099380 A099381
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KEYWORD
| nonn,frac
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Oct 13, 2004
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 04 2010
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