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A068885 Numerator of Sum_{k=1..n} k/phi(k). 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, Section I.27.

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

1, 3, 9/2, 13/2, 31/4, 43/4, 143/12, 167/12, 185/12, ...

CROSSREFS

Cf. A069947, A028415, A048049.

Sequence in context: A305913 A215443 A304664 * A305644 A316920 A018292

Adjacent sequences:  A068882 A068883 A068884 * A068886 A068887 A068888

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Jun 28 2002

STATUS

approved

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Last modified January 22 13:36 EST 2020. Contains 331149 sequences. (Running on oeis4.)