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 A144673 #5 Jan 24 2019 04:51:02 %S A144673 2,20,24,360,816,1056,12240,15840,29120,181632,333200,2724480, %T A144673 93358848,1400382720 %N A144673 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 y. %e A144673 Factorization of a(11) : 17*5^2*2^4*7^2. %Y A144673 Cf. A034448, A144672, A144674. %K A144673 nonn,more %O A144673 1,1 %A A144673 _Yasutoshi Kohmoto_, Feb 02 2009