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%I #10 Mar 31 2023 02:49:27
%S 2,10,3386897,10367022,25898098514,33868444120607410,
%T 3835970218282143377
%N Numbers k such that the k-th triangular number contains only digits {3,5,7}.
%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr357.html">Tridigital Triangular Numbers</a>.
%Y Cf. A000217, A119188. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E a(6)-a(7) from _Tyler Busby_, Mar 31 2023
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