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 A053934 #19 Mar 09 2024 19:34:57
%S A053934 3,17,173,2983,298327,1732017,5412290577,9964933517,5405829167667,
%T A053934 17320185602062360469701767
%N A053934 Numbers k such that k^2 contains only digits {2,8,9}.
%H A053934 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%H A053934 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>)
%t A053934 Table[Select[Sqrt[FromDigits/@Tuples[{2,8,9},n]],IntegerQ],{n,15}]//Flatten (* The program generates the first six terms of the sequence. To generate more, increase the "n" constant but the program will take a long time to run. *) (* _Harvey P. Dale_, Nov 19 2023 *)
%Y A053934 Cf. A053935.
%K A053934 nonn,base,more
%O A053934 1,1
%A A053934 _Patrick De Geest_, Mar 15 2000
%E A053934 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
%E A053934 One more term from _Jon E. Schoenfield_, Sep 04 2006
%E A053934 a(10) from _Zhao Hui Du_, Mar 09 2024