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A099377
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Numerators of the harmonic means of the divisors of the positive integers.
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5
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1, 4, 3, 12, 5, 2, 7, 32, 27, 20, 11, 18, 13, 7, 5, 80, 17, 36, 19, 20, 21, 22, 23, 16, 75, 52, 27, 3, 29, 10, 31, 64, 11, 68, 35, 324, 37, 38, 39, 32, 41, 7, 43, 22, 45, 23, 47, 120, 49, 100, 17, 156, 53, 18, 55, 56, 57, 116, 59, 30, 61, 31, 189, 448, 65, 11, 67, 68, 23, 35
(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); Numerator@ Array[f, 70] [From Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 04 2010]
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CROSSREFS
| Cf. A099378.
Sequence in context: A191617 A169704 A204291 * A121844 A091512 A106285
Adjacent sequences: A099374 A099375 A099376 * A099378 A099379 A099380
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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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