%I
%S 3,11,23,36,123,3651,394123,2307651,74534188,394392348,3639430251,
%T 1159885996348
%N Numbers n such that the nth triangular number contains only digits {2,6,7}.
%C Next entry must be greater than 4.4*10^18.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr267.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119172. See A119034 for a table of crossreferences.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E Lower bound for further terms updated by _Max Alekseyev_, May 07 2009
