|
%I #2 Oct 02 2013 15:47:28
%S 57,77,3777,17777,277777,1777777,17777777,877777777,3777777777,
%T 17777777777,577777777777,1777777777777,37777777777777,
%U 877777777777777,4777777777777777,37777777777777777,277777777777777777
%N Smallest semiprime ending in exactly n 7's.
%e a(3)=3777 is a term because 3777 is the smallest semiprime ending in exactly three 7's.
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, May 12 2005
|
