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 A119058 #10 Jul 13 2021 01:21:02
%S A119058 44,64656155,429439844,632914215,21072266180
%N A119058 Numbers k such that the k-th triangular number contains only digits {0,2,9}.
%C A119058 Next term must be greater than 1.4*10^20. - _Max Alekseyev_, Aug 14 2013
%H A119058 G. Resta, <a href="http://www.numbersaplenty.com/tr/tr029.html">Tridigital Triangular Numbers</a>
%Y A119058 Cf. A000217, A119057. See A119034 for a table of cross-references.
%K A119058 nonn,base,more
%O A119058 1,1
%A A119058 _Giovanni Resta_, May 10 2006