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Smallest semiprime containing exactly n 5's.
0

%I #2 Oct 02 2013 15:47:26

%S 15,55,1555,50555,505555,1555555,55255555,355555555,5155555555,

%T 52555555555,155555555555,1555555555555,25555555555555,

%U 155555555555555,5155555555555555,25555555555555555,505555555555555555

%N Smallest semiprime containing exactly n 5's.

%e a(2)=55 because 55 is the smallest semiprime containing exactly two 5's.

%K base,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Apr 24 2005