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 A054862 #9 Aug 26 2022 05:25:33 %S A054862 105,45045,237405,101846745,121486365,274680671265 %N A054862 (+2)-unitary sigma 3-multiple perfect number: numbers k such that (+2)usigma(k) = 3*k, where (+2)usigma(k) = A107759(k). %e A054862 (+2)usigma(12) = (2+4)*(2+3) = 30. %e A054862 Factorizations: 3*5*7, 3^2*5*7*11*13, 3*5*7^2*17*19, 3^2*5*7^2*11*13*17*19, 3^3*5*7*11*13*29*31, 3^3*5*7^2*11*13*17*19*29*31. %t A054862 s[n_] := Times @@ (2 + Power @@@ FactorInteger[n]); s[1] = 1; Select[Range[2.5*10^5], s[#] == 3*# &] (* _Amiram Eldar_, Aug 26 2022 *) %Y A054862 Cf. A052396, A107759. %K A054862 nonn,more %O A054862 1,1 %A A054862 _Yasutoshi Kohmoto_ %E A054862 Offset corrected by _Amiram Eldar_, Aug 26 2022