A066365 The |sigma(n)-n|-perfect numbers, where f-perfect numbers for an arithmetical function f is defined in A066218.

1134, 1476, 1530, 16600, 282555

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: A122476 A361346 A289253 * A014365 A362543 A027545

Adjacent sequences: A066362 A066363 A066364 * A066366 A066367 A066368

Keyword

nonn

Author

Joseph L. Pe, Dec 21 2001

Status

approved