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 A027676 #23 Jul 16 2025 08:16:48
%S A027676 1,4,16,64,144,441,1444,11664,14161,14641,16641,41616,166464,646416,
%T A027676 6441444,11614464,44116164,166616464,664144441,6114614416,6661661161,
%U A027676 111461164164,41616166464166464,446444416444461444,661161464116616164,16146614646614661444,144164464644611144644
%N A027676 Squares composed of digits {1,4,6}.
%H A027676 Zhao Hui Du, <a href="/A027676/b027676.txt">Table of n, a(n) for n = 1..47</a>
%H A027676 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 A027676 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a>.
%H A027676 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#146">Sporadic tridigital solutions</a>.
%H A027676 A. Ottens, <a href="https://web.archive.org/web/20000902053140/http://einstein.et.tudelft.nl/~arlet/puzzles/sol.cgi/arithmetic/digits/squares/three.digits">The arithmetic-digits-squares-three.digits problem</a>.
%H A027676 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Number</a>.
%F A027676 a(n) = A027677(n)^2. - _Elmo R. Oliveira_, Jul 16 2025
%Y A027676 Cf. A027677.
%K A027676 nonn,base
%O A027676 1,2
%A A027676 _Patrick De Geest_