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 A119076 #9 Jul 13 2021 01:25:22
%S A119076 12655,94319,1268735,2982752019194624,9466159183199999
%N A119076 Numbers k such that the k-th triangular number contains only digits {0,4,8}.
%C A119076 Next entry must be greater than 4.4*10^18. - _Max Alekseyev_, May 17 2009
%H A119076 G. Resta, <a href="http://www.numbersaplenty.com/tr/tr048.html">Tridigital Triangular Numbers</a>
%Y A119076 Cf. A000217, A119075. See A119034 for a table of cross-references.
%K A119076 nonn,base,more
%O A119076 1,1
%A A119076 _Giovanni Resta_, May 10 2006