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 A033635 #5 Apr 19 2016 01:07:31 %S A033635 4,64,48400,37822470400,6935904849126400,11883371958374400, %T A033635 62796991981158400,87762493613171048488960000, %U A033635 874812594495483490385610887270400000000000000 %N A033635 Square-root-perfect numbers: srsigma(n)=m*n^(1/2) for some integer m. %F A033635 If n = Product p(i)^r(i) then srsigma(n) = Product [ (p(i)^(r(i)/2+1/2)-1)/(p(i)^(1/2)-1) ]. %K A033635 nonn %O A033635 0,1 %A A033635 _Yasutoshi Kohmoto_