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Search: id:A057155
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| A057155 |
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Denominator 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, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 3, 3, 3, 6, 6, 3, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 2, 6, 3, 15, 30, 30, 15, 5, 10, 10, 5, 5, 10, 30, 15, 15, 30, 30, 15, 15, 30, 30, 15, 15, 30, 30, 15, 15, 30, 30, 15, 5, 5, 5, 10, 10, 5, 15, 30, 30, 15, 15, 30, 30, 15
(list; graph; listen)
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OFFSET
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1,6
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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. A057158, A020639, A006530.
Sequence in context: A106825 A112505 A104638 this_sequence A037812 A037200 A090044
Adjacent sequences: A057152 A057153 A057154 this_sequence A057156 A057157 A057158
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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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