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 A340919 #11 Mar 01 2021 16:09:14
%S A340919 13,29,35,39,50,52,65,78,87,91,104,116,117,130,140,143,145,174,182,
%T A340919 195,203,221,232,234,247,261,270,286,290,299,305,312,319,325,340,375,
%U A340919 406,429,435,493,522,551,565,575,615,638,665,667,696,705,725,957,1040,1885,2320
%N A340919 Sorted sizes of the 55 squares used in the first known squared square of dimension 4205 X 4205 found by Roland Sprague in 1938.
%H A340919 Stuart Anderson, <a href="http://www.squaring.net/history_theory/sprague.html">Roland Percival Sprague (1894-1967)</a>, history and bibliography on squaring.net.
%H A340919 James Grime, <a href="https://www.youtube.com/watch?v=I0peG_kRE-4">A Nice Square</a>, Numberphile video, 2017.
%H A340919 David Moews, <a href="http://djm.cc/squared-rectangles.html">Squared rectangles</a>, 2007 (provides Bouwcamp code of square).
%H A340919 Roland P. Sprague, <a href="https://doi.org/10.1007/BF01580305">Beispiel einer Zerlegung des Quadrats in lauter verschiedene Quadrate</a>, Mathematische Zeitschrift, 45, 607-608, 1939.
%H A340919 R. Sprague, <a href="http://djm.cc/sprague.pdf">An example of a dissection of the square into pairwise unequal squares</a>, English translation.
%F A340919 Sum_{k=1..55} a(k)^2 = 4205^2.
%Y A340919 Cf. A005670, A006983, A014530, A018835, A089047.
%K A340919 nonn,fini,full
%O A340919 1,1
%A A340919 _Hugo Pfoertner_, Feb 16 2021