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Search: id:A108775
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| A108775 |
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a(n) = floor(sigma(n)/n). |
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+0
1
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| 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1
(list; graph; listen)
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OFFSET
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1,6
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COMMENT
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The sequence is unbounded
First occurrence of k: 1,6,120,27720,..., which is A023199. - Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 28 2005
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REFERENCES
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W. Sierpinski, Elementary Theory of Numbers, 1987, p. 174 ff.
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EXAMPLE
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a(6) = 2 because sigma(6)/6 = (1+2+3+6)/6 = 2
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MATHEMATICA
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Table[ Floor[ DivisorSigma[1, n]/n], {n, 105}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 28 2005)
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CROSSREFS
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Cf. A000203, A054024.
Adjacent sequences: A108772 A108773 A108774 this_sequence A108776 A108777 A108778
Sequence in context: A031263 A107577 A073700 this_sequence A074971 A132587 A008651
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KEYWORD
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nonn
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AUTHOR
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Franz Vrabec (franz.vrabec(AT)planetuniqa.at), Jun 27 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 28 2005
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