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 A119074 #16 Mar 30 2023 20:56:18
%S A119074 3,11,28,36,363,944,1095,9596,29680,89895,3634403,2979955055,
%T A119074 35888885356,9430232920411,963784629929388363,1149318064453932131,
%U A119074 10991327526794969095
%N A119074 Numbers k such that the k-th triangular number contains only digits {0,4,6}.
%H A119074 Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr046.html">Tridigital Triangular Numbers</a>
%Y A119074 Cf. A000217, A119073. See A119034 for a table of cross-references.
%K A119074 nonn,base,more
%O A119074 1,1
%A A119074 _Giovanni Resta_, May 10 2006
%E A119074 Two more terms from _Max Alekseyev_, May 10 2009
%E A119074 a(17) from _Tyler Busby_, Mar 30 2023