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A065915
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Numerator[DivisorSigma[1,8*n^2]/DivisorSigma[1,4*n^2]].
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
| sigma[72]/sigma[36] = 15/7; The sequence is not periodic,values of numerators are always -1+2^s.
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PROG
| (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
| A000203
Sequence in context: A157446 A067572 A066584 * A062965 A157968 A141759
Adjacent sequences: A065912 A065913 A065914 * A065916 A065917 A065918
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Nov 28 2001
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