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 A027677 #21 Jul 16 2025 07:08:31
%S A027677 1,2,4,8,12,21,38,108,119,121,129,204,408,804,2538,3408,6642,12908,
%T A027677 25771,78196,81619,333858,204000408,668164962,813118358,4018285038,
%U A027677 12006850738,12694138988,12706943631,40182224262,40578463021,785153912392,1210019200121,1210150449796
%N A027677 When squared gives number composed of digits {1,4,6}.
%H A027677 Zhao Hui Du, <a href="/A027677/b027677.txt">Table of n, a(n) for n = 1..47</a>
%H A027677 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 A027677 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a>
%H A027677 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 A027677 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Number</a>
%Y A027677 Cf. A027676.
%K A027677 nonn,base
%O A027677 1,2
%A A027677 _Patrick De Geest_