%I #10 Dec 26 2023 18:06:15
%S 121,484,91809,163216,255025,367236,499849,64128064,81162081,
%T 100200100,121242121,144288144,169338169,196392196,225450225,
%U 256512256,289578289,324648324,361722361,400800400,441882441,484968484,52910580529
%N Squares of the form u'v'w, where in decimal representation u=n^2, v=2*n^2 and w=n^2 possibly with a leading zero.
%C a(n) = A077431(n)^2.
%F a(n) = (n*(1 + 10^(1 + floor(log_10(2*n^2)))))^2.
%e n=42, n^2=1764 and 2*n^2=3528: a(42) = 1764'3528'1764 = 420042^2 = A077431(42)^2.
%Y Cf. A004216, A077430, A077431.
%K nonn,base,nice
%O 1,1
%A _Reinhard Zumkeller_, Nov 05 2002