%I #12 Jul 13 2021 07:25:56
%S 9,10,225,714,6714,22114,2119209,2211449,102523609,942573334,
%T 95336514049,3333030289167658390
%N Numbers k such that the k-th triangular number contains only digits {2,4,5}.
%C Next term exceeds 1.4*10^20.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr245.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119158. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E a(12) from _Max Alekseyev_, Aug 19 2013