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A160972
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Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 13.
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7
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1, 4095, 265720, 8386560, 61035156, 1088123400, 2306881200, 17175674880, 47071500840, 249938963820, 313842837672, 2228476723200, 1941507093540, 9446678514000, 16218261652320, 35175782154240, 36413889826860
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| J. H. Kwak and J. Lee, Enumeration of graph coverings, surface branched coverings and related group theory, in Combinatorial and Computational Mathematics (Pohang, 2000), ed. S. Hong et al., World Scientific, Singapore 2001, pp. 97-161. See p. 134.
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FORMULA
| a(n)=J_12(n)/J_1(n) where J_12 and J_1(n)=A000010(n) are Jordan functions. - R. J. Mathar, Jul 12 2011
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CROSSREFS
| Sequence in context: A075957 A075953 A011562 * A038999 A022528 A024010
Adjacent sequences: A160969 A160970 A160971 * A160973 A160974 A160975
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KEYWORD
| nonn,mult
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 19 2009
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EXTENSIONS
| Definition corrected by Enrique Perez Herrero (psychgeometry(AT)gmail.com), Oct 30 2010
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