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%I #10 Jul 13 2021 21:28:44
%S 2,10,34,109,8189,108989,4470645,32727845,1095073836189,
%T 1091781620649419010
%N Numbers k such that the k-th triangular number contains only digits {3,5,9}.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr359.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119192. 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 _Max Alekseyev_, May 21 2011
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