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 A144672 #14 Jan 24 2019 04:50:55 %S A144672 2,20,24,360,816,1056,12240,15840,29120,181632,337977,2724480, %T A144672 93358848,1400382720 %N A144672 Numbers x,y,z such that UnitarySigma(x) = UnitarySigma(y) = UnitarySigma(z) = 3*(x*y*z)^(1/2)/(- x^(1/2) + 8*y^(1/2) - 5*z^(1/2)), z<=y<=x; sequence gives x. %C A144672 a(11) is the smallest term for x!=y, y!=z, x!=z. %C A144672 If x=y=z then we get multiply unitary perfect numbers such that UnitarySigma(x)=3x/2. %e A144672 Factorization of a(11) : 17*3^2*47^2. %Y A144672 Cf. A034448, A144673, A144674 (these entries all differ at a(11)). %K A144672 nonn,more %O A144672 1,1 %A A144672 _Yasutoshi Kohmoto_, Feb 02 2009