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 A053957 #21 Jul 18 2025 08:31:15
%S A053957 4,64,676,7744,4444667464644,66667767777644764644,
%T A053957 767646664777467676766464,6446477674444767467664676,
%U A053957 7446477664767776477464446664464,64446474444746646444646744666444644,664676644466466777446466766667744446667647467664
%N A053957 Squares composed of digits {4,6,7}.
%H A053957 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>.
%H A053957 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Squares consisted of 3 different digits</a>.
%H A053957 Author?, <a href="http://web.archive.org/web/20080708203024/http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</a>(<a href="http://web.archive.org/web/20060426155831/http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>)
%F A053957 a(n) = A053956(n)^2. - _Elmo R. Oliveira_, Jul 17 2025
%Y A053957 Cf. A053956.
%K A053957 nonn,base,more
%O A053957 1,1
%A A053957 _Patrick De Geest_, Mar 15 2000
%E A053957 a(6)-a(7) from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
%E A053957 a(8) from _Jon E. Schoenfield_, Sep 04 2006
%E A053957 a(9)-a(10) from Mishima's website added by _Max Alekseyev_, May 07 2009
%E A053957 a(11) from Mishima's website added by _Elmo R. Oliveira_, Jul 17 2025