%I #12 Mar 31 2023 02:49:24
%S 3,11,36,76,7741188,21305723,4471447856,24343059348,6673334543723,
%T 23094123478785548
%N Numbers k such that the k-th triangular number contains only digits {2,6,9}.
%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr269.html">Tridigital Triangular Numbers</a>.
%Y Cf. A000217, A119176. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E a(10) from _Tyler Busby_, Mar 31 2023