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 A053963 #17 Jul 19 2025 10:13:16
%S A053963 4,484,784,7744,7478444484,8878844747774884,
%T A053963 84788447488748874848488744487874447844,
%U A053963 484844884744844787448744774844887478884,48784888484784787487448774777744787448847474447478448784
%N A053963 Squares composed of digits {4,7,8}.
%H A053963 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 A053963 Hisanori Mishima <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Squares consisted of 3 different digits</a>. [From _Max Alekseyev_, Mar 10 2009]
%F A053963 a(n) = A053962(n)^2. - _Elmo R. Oliveira_, Jul 18 2025
%Y A053963 Cf. A053962.
%K A053963 nonn,base,more
%O A053963 1,1
%A A053963 _Patrick De Geest_, Mar 15 2000
%E A053963 a(7)-a(8) from Mishima's page added by _Max Alekseyev_, Mar 10 2009
%E A053963 a(9) from _Zhao Hui Du_, Mar 10 2024