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Search: id:A090395
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| A090395 |
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Denominator of d(n)/n, where d(n) (A000005) is the number of divisors of n. |
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+0
4
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| 1, 1, 3, 4, 5, 3, 7, 2, 3, 5, 11, 2, 13, 7, 15, 16, 17, 3, 19, 10, 21, 11, 23, 3, 25, 13, 27, 14, 29, 15, 31, 16, 33, 17, 35, 4, 37, 19, 39, 5, 41, 21, 43, 22, 15, 23, 47, 24, 49, 25, 51, 26, 53, 27, 55, 7, 57, 29, 59, 5, 61, 31, 21, 64, 65, 33, 67, 34, 69, 35, 71, 6, 73, 37, 25, 38
(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 given in A091895.
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EXAMPLE
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a(6)=3 because the number of divisors of 6 is 4 and 4 divided by 6 equals 2/3, which has 3 as its denominator.
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MAPLE
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with(numtheory): seq(denom(tau(n)/n), n=1..75) ; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2008
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MATHEMATICA
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Table[ Denominator[ DivisorSigma[0, n]/n], {n, 1, 80}] (from Robert G. Wilson v Feb 04 2004)
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CROSSREFS
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Cf. A090387.
Sequence in context: A033706 A121890 A137926 this_sequence A123901 A093395 A126352
Adjacent sequences: A090392 A090393 A090394 this_sequence A090396 A090397 A090398
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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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