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 A119068 #10 Jul 13 2021 01:20:17
%S A119068 2,24,77,126797,12714624,129079888464,77885018846797,4009565647007922,
%T A119068 40750555532000002
%N A119068 Numbers k such that the k-th triangular number contains only digits {0,3,8}.
%C A119068 Next term exceeds 1.4*10^17.
%H A119068 G. Resta, <a href="http://www.numbersaplenty.com/tr/tr038.html">Tridigital Triangular Numbers</a>
%Y A119068 Cf. A000217, A119067. See A119034 for a table of cross-references.
%K A119068 nonn,base,more
%O A119068 1,1
%A A119068 _Giovanni Resta_, May 10 2006
%E A119068 One more term from _Max Alekseyev_, Mar 09 2009