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 A053901 #19 Jul 16 2025 10:12:33
%S A053901 1,4,81,144,441,484,841,1444,11881,14884,48841,1418481,414488881,
%T A053901 144418888188481,4141181448448144,4811118811848441,11181184881818884,
%U A053901 1814448814844418841,114811414848448481881,441148818414884144184841,884188888841188881111184,18181411818114841118484484
%N A053901 Squares composed of digits {1,4,8}.
%H A053901 Zhao Hui Du, <a href="/A053901/b053901.txt">Table of n, a(n) for n = 1..31</a>
%H A053901 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 A053901 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 A053901 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#148">Sporadic tridigital solutions</a>.
%F A053901 a(n) = A053900(n)^2. - _Elmo R. Oliveira_, Jul 16 2025
%Y A053901 Cf. A053900.
%K A053901 nonn,base
%O A053901 1,2
%A A053901 _Patrick De Geest_, Mar 15 2000
%E A053901 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005