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Search: id:A088818
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| A088818 |
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Abundance-radius of n = Abs[sigma[n]-2n]<=log[log[n]]. |
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+0
2
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| 6, 16, 28, 32, 64, 128, 256, 496, 512, 1024, 1952, 2048, 4096, 8128, 8192, 16384, 32768, 32896, 65536, 130304, 131072, 262144, 522752, 524288, 1048576, 2097152, 4194304
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OFFSET
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1,1
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EXAMPLE
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Perfect numbers are here.
It is an infinite sequence since includes A000079,
[as quasiperfect numbers].
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MATHEMATICA
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abu[x_] := Abs[DivisorSigma[1, x]-2*x] Do[If[ !Greater[abu[n], Log[Log[n]]//N], Print[n]], {n, 1, 1000000}
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CROSSREFS
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Cf. A088009-A088012, A077374, A000396, A000079.
Sequence in context: A011536 A043513 A017341 this_sequence A032422 A054000 A113742
Adjacent sequences: A088815 A088816 A088817 this_sequence A088819 A088820 A088821
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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), Oct 20 2003
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