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%I #8 Jul 13 2021 07:32:20
%S 1,2,3,8,11,16,36,163,816,115166,475633,1151836,5677378,35585421,
%T 35598136,51596833,258114833,1152095166,11060118546,112366468411,
%U 1797838514253,11234888843541,78909614580621,1632858433307288
%N Numbers k such that the k-th triangular number contains only digits {1,3,6}.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr136.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119115. See A119034 for a table of cross-references.
%K nonn,base
%O 1,2
%A _Giovanni Resta_, May 10 2006