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Search: id:A059118
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| A059118 |
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Composite solutions to sigma(x)+8=sigma(x+8). |
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+0
4
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| 27, 1615, 1885, 218984, 4218475, 312016315, 746314601, 1125845307, 1132343549, 1296114929
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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The first 4 terms were found by Labos E. (labos(AT)ana.sote.hu), see A015915.
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EXAMPLE
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sigma(27)+8 = 48 = sigma(27+8), so 27 is in the sequence.
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MATHEMATICA
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ta={{0}}; Do[If[Equal[DivisorSigma[1, n+8] -DivisorSigma[1, n]-8, 0]&&!PrimeQ[n], Print[n]; ta=Append[ta, n]], {n, 1000000000, 1300000000}]; ta=Delete[ta, 1] (Labos)
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CROSSREFS
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Cf. A015915.
Sequence in context: A042407 A042404 A073224 this_sequence A017199 A013779 A075081
Adjacent sequences: A059115 A059116 A059117 this_sequence A059119 A059120 A059121
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KEYWORD
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nonn,more
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net), Jan 06 2001
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EXTENSIONS
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a(8)-a(10) terms from Labos E.(Jan 10 2005);
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