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 A053908 #13 Mar 09 2024 18:29:03
%S A053908 1,4,9,41,109,1291,28604,78541,81619,782104,1054119,3341881,4345881,
%T A053908 25823791,29439546,129105041,817851954,931064546,2486185454,
%U A053908 2609955204,24862847104,786680914454
%N A053908 Numbers k such that k^2 contains only digits {1,6,8}.
%H A053908 Zhao Hui Du, <a href="/A053908/b053908.txt">Table of n, a(n) for n = 1..27</a>
%H A053908 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 A053908 Cf. A053909.
%K A053908 nonn,base
%O A053908 1,2
%A A053908 _Patrick De Geest_, Mar 15 2000
%E A053908 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005