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A066365 The |sigma(n)-n|-perfect numbers, where f-perfect numbers for an arithmetical function f is defined in A066218. 0
1134, 1476, 1530, 16600, 282555 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..5.

J. Pe, On a Generalization of Perfect Numbers, J. Rec. Math., 31(3) (2002-2003), 168-172.

MATHEMATICA

f[x_] := Abs[DivisorSigma[1, x] - x]; Select[ Range[2, 10^6], 2 * f[ # ] == Apply[ Plus, Map[ f, Divisors[ # ] ] ] & ]

CROSSREFS

Cf. A066218.

Sequence in context: A163651 A122476 A289253 * A014365 A027545 A113708

Adjacent sequences:  A066362 A066363 A066364 * A066366 A066367 A066368

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Dec 21 2001

STATUS

approved

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Last modified October 14 09:25 EDT 2019. Contains 327995 sequences. (Running on oeis4.)