%I #7 Jul 13 2021 21:28:54
%S 2,10,129,841229,26014826114,3417172921745,10520014765729
%N Numbers k such that the k-th triangular number contains only digits {3,5,8}.
%C Next term exceeds 1.4*10^16.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr358.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119190. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006