Search: id:a066365
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A066365
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The |sigma(n)-n|-perfect numbers, where f-perfect numbers for an arithmetical function f is defined in A066218.
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+0
0
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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f[x_] := Abs[DivisorSigma[1, x] - x]; Select[ Range[2, 10^6], 2 * f[ # ] == Apply[ Plus, Map[ f, Divisors[ # ] ] ] & ]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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