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Search: id:A083541
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| A083541 |
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Values of y from solutions to sigma[x+1].sigma[x]=y^2, where A083539(m)=y^2,a square number. |
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1
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| 24, 48, 84, 264, 288, 312, 336, 576, 960, 1152, 1440, 1440, 1440, 1440, 1680, 2100, 2160, 2688, 2640, 3360, 3024, 3360, 3360, 4320, 4320, 5376, 4032, 4464, 5040, 4788, 6048, 7392, 6720, 6840, 7644, 6300, 7440, 7560, 7020, 10080, 10080, 8064, 10080
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=Sqrt(sigma[A083540(n)]*sigma[1+A083540(n)]).
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MATHEMATICA
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Do[s=Sqrt[DivisorSigma[1, n+1]*DivisorSigma[1, n]]; If[IntegerQ[s], Print[s]], {n, 1, 5000}]
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CROSSREFS
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Cf. A000203, A083539, A083540, A083538, A060780, A060781.
Sequence in context: A141767 A054734 A029613 this_sequence A073763 A030021 A105844
Adjacent sequences: A083538 A083539 A083540 this_sequence A083542 A083543 A083544
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 21 2003
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