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A088818
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Abundance-radius of n = Abs[sigma[n]-2n]<=log[log[n]].
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1
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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, 8382464, 8388608, 16777216, 33550336, 33554432, 67108864, 134193152
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| Perfect numbers are here.
It is an infinite sequence since includes A000079,
[as quasiperfect numbers].
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MATHEMATICA
| 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
| Cf. A088009-A088012, A077374, A000396, A000079.
Sequence in context: A191157 A191117 A201020 * A032422 A164052 A168472
Adjacent sequences: A088815 A088816 A088817 * A088819 A088820 A088821
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Oct 20 2003
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EXTENSIONS
| a(28)-a(34) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 21 2008
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