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A160953
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Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 10.
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2
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1, 511, 9841, 130816, 488281, 5028751, 6725601, 33488896, 64566801, 249511591, 235794769, 1287360256, 883708281, 3436782111, 4805173321, 8573157376, 7411742281, 32993635311, 17927094321, 63874967296, 66186639441
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OFFSET
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1,2
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REFERENCES
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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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LINKS
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Enrique Pérez Herrero, Table of n, a(n) for n = 1..5000
Enrique Pérez Herrero, Mathematica Package: Jordan Totient Function.
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FORMULA
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a(n)=J_9(n)/phi(n)=A069094(n)/A000010(n)
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MATHEMATICA
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JordanTotient[n_, k_:1]:=DivisorSum[n, #^k*MoebiusMu[n/#]&]/; (n>0)&&IntegerQ[n];
A160953[n_]:=JordanTotient[n, 9]/JordanTotient[n];
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CROSSREFS
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Sequence in context: A204739 A075948 A011559 * A038996 A068025 A075943
Adjacent sequences: A160950 A160951 A160952 * A160954 A160955 A160956
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KEYWORD
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nonn,mult
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AUTHOR
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N. J. A. Sloane, Nov 19 2009
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EXTENSIONS
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Definition corrected by Enrique Pérez Herrero, Oct 30 2010
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STATUS
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approved
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