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%I #9 Jul 13 2021 21:31:25
%S 3,11,36,36817576,365512507857054543
%N Numbers k such that the k-th triangular number contains only digits {6,7,9}.
%C Next term exceeds 4.4*10^17.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr679.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119232. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E 365512507857054543 from _Max Alekseyev_, Mar 10 2009
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