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Search: id:A069947
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| A069947 |
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Denominator of Sum_{k=1..n} k/phi(k). |
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+0
2
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| 1, 1, 2, 2, 4, 4, 12, 12, 12, 12, 60, 60, 10, 30, 120, 120, 240, 240, 720, 720, 720, 720, 7920, 7920, 7920, 7920, 7920, 7920, 55440, 55440, 11088, 11088, 55440, 55440, 55440, 55440, 18480, 55440, 55440, 55440, 55440, 55440, 55440, 11088, 11088, 11088, 255024, 255024
(list; graph; listen)
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OFFSET
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1,3
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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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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. A068885, A028415, A048049.
Sequence in context: A125553 A138317 A103659 this_sequence A051547 A095329 A140723
Adjacent sequences: A069944 A069945 A069946 this_sequence A069948 A069949 A069950
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jun 28 2002
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