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 A058450 #10 Oct 26 2019 18:01:07
%S A058450 676,67667076,670066667776,66007077776676,
%T A058450 676670006660660066767076066770670707776
%N A058450 Squares composed of digits {0,6,7}, not ending with zero.
%H A058450 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058450 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Sporadic tridigital solutions</a>
%Y A058450 Cf. A058449.
%K A058450 nonn,base,hard,more
%O A058450 1,1
%A A058450 _Patrick De Geest_, Nov 15 2000
%E A058450 One more term from Mishima's webpage added by _Max Alekseyev_, Jul 27 2009