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Search: id:A057158
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| A057158 |
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Numerator of Sum_{k<=n} p(k)/P(k), where p(k) (resp. P(k)) is smallest (resp. largest) prime divisor of k. |
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+0
2
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| 1, 2, 3, 4, 5, 13, 15, 17, 19, 12, 13, 29, 31, 19, 62, 65, 68, 145, 151, 83, 30, 71, 73, 38, 39, 91, 93, 50, 51, 107, 109, 111, 355, 203, 1036, 2117, 2147, 1216, 427, 879, 889, 462, 467, 989, 3017, 1681, 1696, 3437, 3467, 1771, 1856, 3907, 3937
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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Handbook of Number Theory, D. S. Mitrinovic et al., Kluwer, Section IV.1(2).
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EXAMPLE
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Sequence begins 1, 2, 3, 4, 5, 13/2, 15/2, 17/2, 19/2, 12, 13, 29/2, ...
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CROSSREFS
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Cf. A057155, A020639, A006530.
Sequence in context: A101546 A026471 A039039 this_sequence A138986 A098552 A037340
Adjacent sequences: A057155 A057156 A057157 this_sequence A057159 A057160 A057161
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KEYWORD
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nonn,frac,easy
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AUTHOR
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njas, Sep 13 2000
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