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 A119092 #13 Mar 31 2023 00:49:54
%S A119092 3,11,36,44,363,371,1095,1104,1175,44036,348396,440363,366060011,
%T A119092 439560371,3715095963,140755746596,3651575002644,11042554867508396,
%U A119092 36350791163221211520
%N A119092 Numbers k such that the k-th triangular number contains only digits {0,6,9}.
%H A119092 Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr069.html">Tridigital Triangular Numbers</a>.
%Y A119092 Cf. A000217, A119091. See A119034 for a table of cross-references.
%K A119092 nonn,base,more
%O A119092 1,1
%A A119092 _Giovanni Resta_, May 10 2006
%E A119092 a(19) from _Tyler Busby_, Mar 30 2023