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 A119067 #12 Mar 28 2023 21:12:26
%S A119067 3,300,3003,8038803003,80830838088000,8330808803003880083880,
%T A119067 3033038080383000888388003003,8038308338833030088338388883003,
%U A119067 830303888083308003388388830000003
%N A119067 Triangular numbers composed of digits {0,3,8}.
%C A119067 a(10) > 10^43. - _Tyler Busby_, Mar 28 2023
%H A119067 Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr038.html">Tridigital Triangular Numbers</a>.
%F A119067 a(n) = A000217(A119068(n)). - _Tyler Busby_, Mar 28 2023
%Y A119067 Cf. A000217, A119068. See A119033 for a table of cross-references.
%K A119067 nonn,base,more
%O A119067 1,1
%A A119067 _Giovanni Resta_, May 10 2006
%E A119067 One more term from _Max Alekseyev_, Mar 09 2009