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%I #7 Jul 13 2021 21:30:28
%S 3,11,36,976,1236,3048,964131,36536961224668,123828734689848,
%T 299247973315331
%N Numbers k such that the k-th triangular number contains only digits {4,6,7}.
%C Next term exceeds 1.4*10^16.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr467.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119210. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006
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