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A068885
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Numerator of Sum_{k=1..n} k/phi(k).
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1
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1, 3, 9, 13, 31, 43, 143, 167, 185, 215, 1141, 1321, 231, 763, 3277, 3517, 7289, 8009, 24787, 26587, 27847, 29431, 332021, 355781, 365681, 382841, 394721, 413201, 2949827, 3157727, 643003, 665179, 3417371, 3535181, 3616031, 3782351, 1279777, 3956371, 4046461
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OFFSET
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1,2
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REFERENCES
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D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, Section I.27.
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LINKS
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Table of n, a(n) for n=1..39.
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EXAMPLE
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1, 3, 9/2, 13/2, 31/4, 43/4, 143/12, 167/12, 185/12, ...
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CROSSREFS
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Cf. A069947, A028415, A048049.
Sequence in context: A014861 A018407 A215443 * A018292 A089147 A094043
Adjacent sequences: A068882 A068883 A068884 * A068886 A068887 A068888
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane, Jun 28 2002
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STATUS
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approved
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