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 A053910 #18 Mar 09 2024 18:34:16
%S A053910 1,3,4,13,14,31,263,264,3114,4119,24737,81619,834386,1382737,9959514,
%T A053910 10775719,341608987,836460469,998053937,24737858031,40201507014,
%U A053910 99599046013,2488372283063,8361615872313
%N A053910 Numbers k such that k^2 contains only digits {1,6,9}.
%H A053910 Zhao Hui Du, <a href="/A053910/b053910.txt">Table of n, a(n) for n = 1..31</a>
%H A053910 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>)
%H A053910 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%Y A053910 Cf. A053911.
%K A053910 nonn,base
%O A053910 1,2
%A A053910 _Patrick De Geest_, Mar 15 2000
%E A053910 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
%E A053910 Two more terms from _Jon E. Schoenfield_, Sep 03 2006