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 A027678 #26 Feb 16 2025 08:32:35
%S A027678 4,484,28224,228484,8282884,44484284288828484,
%T A027678 244848282488224248488284224,2284884224228428242888448884484,
%U A027678 42884424422284228884248482424484,448424228448248888288442822222282244,424242448424484484244824228422488282244
%N A027678 Squares composed of digits {2,4,8}.
%D A027678 Ilan Vardi, Computational Recreations in Mathematica, Chapter 2, Exercise 2.2.
%H A027678 Zhao Hui Du, <a href="/A027678/b027678.txt">Table of n, a(n) for n = 1..15</a>
%H A027678 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 A027678 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a>
%H A027678 H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#248">Sporadic tridigital solutions</a>.
%H A027678 A. Ottens, <a href="http://einstein.et.tudelft.nl/~arlet/puzzles/sol.cgi/arithmetic/digits/squares/three.digits">The arithmetic-digits-squares-three.digits problem</a>.
%H A027678 T. Sillke, <a href="http://www.mathematik.uni-bielefeld.de/~sillke/SEQUENCES/series002">What square consists entirely of three digits(e.g. 2,4 and 8)?</a>
%H A027678 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Number</a>.
%F A027678 a(n) = A027679(n)^2.
%Y A027678 Cf. A027679.
%K A027678 nonn,base
%O A027678 1,1
%A A027678 _Patrick De Geest_
%E A027678 One more term from _Jon E. Schoenfield_, Sep 04 2006
%E A027678 More terms from Mishima's page added by _Max Alekseyev_, Jan 28 2012