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 A077432 #10 Dec 26 2023 18:06:15 %S A077432 121,484,91809,163216,255025,367236,499849,64128064,81162081, %T A077432 100200100,121242121,144288144,169338169,196392196,225450225, %U A077432 256512256,289578289,324648324,361722361,400800400,441882441,484968484,52910580529 %N A077432 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 A077432 a(n) = A077431(n)^2. %F A077432 a(n) = (n*(1 + 10^(1 + floor(log_10(2*n^2)))))^2. %e A077432 n=42, n^2=1764 and 2*n^2=3528: a(42) = 1764'3528'1764 = 420042^2 = A077431(42)^2. %Y A077432 Cf. A004216, A077430, A077431. %K A077432 nonn,base,nice %O A077432 1,1 %A A077432 _Reinhard Zumkeller_, Nov 05 2002