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A028415
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Numerator of Sum_{k=1..n} 1/phi(k).
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3
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1, 2, 5, 3, 13, 15, 47, 25, 13, 55, 281, 74, 301, 311, 637, 163, 1319, 453, 4117, 4207, 4267, 4339, 48089, 49079, 9895, 10027, 10115, 10247, 72125, 73511, 369403, 93217, 9391, 75821, 76283, 77207, 77515, 78131, 78593, 39643, 49727, 100609, 100939, 25408, 204419
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, Section I.27.
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LINKS
| Eric Weisstein's World of Mathematics, Totient Summatory Function
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EXAMPLE
| 1, 2, 5/2, 3, 13/4, 15/4, 47/12, 25/6, 13/3, 55/12, 281/60, 74/15, ...
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CROSSREFS
| Cf. A048049.
Sequence in context: A176914 A194010 A091265 * A035334 A002565 A063703
Adjacent sequences: A028412 A028413 A028414 * A028416 A028417 A028418
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KEYWORD
| nonn,frac
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 28 2002
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