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 A053904 #13 Aug 11 2024 14:41:32
%S A053904 1,9,109,296848141,4341833151859,3399291958357679641,
%T A053904 2412237158970509643109
%N A053904 Numbers k such that k^2 contains only digits {1,5,8}.
%H A053904 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%H A053904 H. Mishima <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Squares consisted of 3 different digits</a> [From _Max Alekseyev_, May 21 2009]
%Y A053904 Cf. A053905.
%K A053904 nonn,base,more
%O A053904 1,2
%A A053904 _Patrick De Geest_, Mar 15 2000
%E A053904 One more term from _Jon E. Schoenfield_, Sep 03 2006
%E A053904 Two more terms from Mishima's webpage added by _Max Alekseyev_, May 21 2009