%I #5 Apr 19 2016 01:07:31

%S 4,64,48400,37822470400,6935904849126400,11883371958374400,

%T 62796991981158400,87762493613171048488960000,

%U 874812594495483490385610887270400000000000000

%N Square-root-perfect numbers: srsigma(n)=m*n^(1/2) for some integer m.

%F 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 nonn

%O 0,1

%A _Yasutoshi Kohmoto_