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 A119096 #8 Jul 13 2021 01:24:27
%S A119096 44,40244,424049735,14064073448975
%N A119096 Numbers k such that the k-th triangular number contains only digits {0,8,9}.
%C A119096 Next term exceeds 1.4*10^16.
%H A119096 G. Resta, <a href="http://www.numbersaplenty.com/tr/tr089.html">Tridigital Triangular Numbers</a>
%Y A119096 Cf. A000217, A119095. See A119034 for a table of cross-references.
%K A119096 nonn,base,more
%O A119096 1,1
%A A119096 _Giovanni Resta_, May 10 2006