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%I #6 Sep 24 2018 16:53:14
%S 9,299,5999,19999,899999,5999999,79999999,299999999,1999999999,
%T 49999999999,499999999999,1999999999999,29999999999999,
%U 199999999999999,1999999999999999,29999999999999999,599999999999999999
%N Smallest semiprime containing exactly n 9's.
%C When (if ever) does this differ from A106663? - _Andrew S. Plewe_, Apr 11 2007
%e a(2)=299 because 299 is the smallest semiprime containing exactly two 9's.
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, Apr 24 2005