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Search: id:A065915
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| A065915 |
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Numerator[DivisorSigma[1,8*n^2]/DivisorSigma[1,4*n^2]]. |
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+0
2
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| 15, 63, 15, 255, 15, 63, 15, 1023, 15, 63, 15, 255, 15, 63, 15, 4095, 15, 63, 15, 255, 15, 63, 15, 1023, 15, 63, 15, 255, 15, 63, 15, 16383, 15, 63, 15, 255, 15, 63, 15, 1023, 15, 63, 15, 255, 15, 63, 15, 4095, 15, 63, 15, 255, 15, 63, 15, 1023, 15, 63, 15, 255, 15, 63
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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sigma[72]/sigma[36] = 15/7; The sequence is not periodic,values of numerators are always -1+2^s.
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PROGRAM
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(PARI) { for (n=1, 1000, a=numerator(sigma(8*n^2)/sigma(4*n^2)); write("b065915.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 04 2009]
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CROSSREFS
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A000203
Sequence in context: A157446 A067572 A066584 this_sequence A062965 A157968 A141759
Adjacent sequences: A065912 A065913 A065914 this_sequence A065916 A065917 A065918
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KEYWORD
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nonn,new
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 28 2001
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