%I
%S 520,975,2040,3567,7215,7800,9840,13920,19680,30160,40545,53040,57720,
%T 62985,95120,108225,138040,151320,180960,230880,247520,286200,289952,
%U 352495,473280,535353,546975,720945,769600,1048560,1141920,1210560
%N Positive integers n such that n^2 = (x^4  y^4)*(z^4  t^4) where x>y and z>t are distinct pairs of integers with gcd(x,y)=gcd(z,t)=1.
%C Positive integers n such that n^2 = A147858(m)*A147858(k) for positive integers k<m. Primitive elements of A147854: any element n of A147854 is of the form a(k)*s^2 for some positive integer s.
%C 4*A196289(2*k) and A196289(2*k+1) belong to this sequence.
%K nonn
%O 1,1
%A _Max Alekseyev_, Nov 18 2008
