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A048049
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Denominator of Sum_{k=1..n} 1/phi(k).
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3
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1, 1, 2, 1, 4, 4, 12, 6, 3, 12, 60, 15, 60, 60, 120, 30, 240, 80, 720, 720, 720, 720, 7920, 7920, 1584, 1584, 1584, 1584, 11088, 11088, 55440, 13860, 1386, 11088, 11088, 11088, 11088, 11088, 11088, 5544, 6930, 13860, 13860, 3465, 27720, 27720, 637560, 1275120, 182160
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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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. A028415.
Sequence in context: A119282 A095293 A034409 * A057772 A145861 A191660
Adjacent sequences: A048046 A048047 A048048 * A048050 A048051 A048052
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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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