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 A119060 #8 Jul 13 2021 01:20:40
%S A119060 2,24,77,82,2624,26242,29442,82877,2840082,82825117,93091399,
%T A119060 774641122,816508460,9423378739,81731319999,246333119999,
%U A119060 2976590096077,8164967169602
%N A119060 Numbers k such that the k-th triangular number contains only digits {0,3,4}.
%C A119060 Next term exceeds 1.4*10^16.
%H A119060 G. Resta, <a href="http://www.numbersaplenty.com/tr/tr034.html">Tridigital Triangular Numbers</a>
%Y A119060 Cf. A000217, A119059. See A119034 for a table of cross-references.
%K A119060 nonn,base,more
%O A119060 1,1
%A A119060 _Giovanni Resta_, May 10 2006