This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A066365 #15 Aug 06 2025 18:30:29 %S A066365 1,1134,1476,1530,16600,282555 %N A066365 f-perfect numbers, where f(m) = sigma(m)-m. %C A066365 f-perfect numbers for an arithmetical function f is defined in A066218. %C A066365 Also, numbers m such that 3*sigma(m)-2*m = A007429(m). - _Max Alekseyev_, Jul 30 2025 %H A066365 J. Pe, <a href="https://vixra.org/abs/2503.0165">On a Generalization of Perfect Numbers</a>, J. Rec. Math., 31(3) (2002-2003), 168-172. %t A066365 f[x_] := Abs[DivisorSigma[1, x] - x]; Select[ Range[2, 10^6], 2 * f[ # ] == Apply[ Plus, Map[ f, Divisors[ # ] ] ] & ] %Y A066365 Cf. A007429, A066218. %K A066365 nonn,more %O A066365 1,2 %A A066365 _Joseph L. Pe_, Dec 21 2001 %E A066365 Edited and a(1)=1 inserted by _Max Alekseyev_, Jul 30 2025