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%I #2 Oct 02 2013 15:47:25
%S 4,445,4414,44441,444441,4444441,44444441,444444449,4444444441,
%T 44444444443,444444444447,4444444444443,44444444444441,
%U 444444444444445,4444444444444447,44444444444444447,444444444444444442
%N Smallest semiprime containing exactly n 4's.
%e a(2)=445 because 445 is the smallest semiprime containing exactly two 4's.
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, Apr 24 2005
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