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Search: id:A090387
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| A090387 |
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Numerator of d(n)/n, where d(n) (A000005) is the number of divisors of n. |
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+0
2
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| 1, 1, 2, 3, 2, 2, 2, 1, 1, 2, 2, 1, 2, 2, 4, 5, 2, 1, 2, 3, 4, 2, 2, 1, 3, 2, 4, 3, 2, 4, 2, 3, 4, 2, 4, 1, 2, 2, 4, 1, 2, 4, 2, 3, 2, 2, 2, 5, 3, 3, 4, 3, 2, 4, 4, 1, 4, 2, 2, 1, 2, 2, 2, 7, 4, 4, 2, 3, 4, 4, 2, 1, 2, 2, 2, 3, 4, 4, 2, 1, 5, 2, 2, 1, 4, 2, 4, 1, 2, 2, 4, 3, 4, 2, 4, 1, 2, 3, 2, 9, 2, 4, 2, 1, 8
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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The first occurrence of k is: 1,3,4,15,16,175,64,105,100,567,1024,1925,4096,3645,784,945,65536,... - Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 04 2004
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EXAMPLE
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a(6)=2 because the number of divisors of 6 is 4 and 4 divided by 6 equals 2/3, which has 2 as its numerator.
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MAPLE
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with(numtheory): seq(numer(tau(n)/n), n=1..105) ; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2008
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CROSSREFS
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Cf. A090395.
Sequence in context: A112966 A160570 A128830 this_sequence A030329 A120881 A031217
Adjacent sequences: A090384 A090385 A090386 this_sequence A090388 A090389 A090390
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KEYWORD
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easy,frac,nonn
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AUTHOR
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Ivan_E_Mayle(AT)a_provider.com, Jan 31 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 04 2004
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