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Smallest semiprime ending in exactly n 1's.
0

%I #2 Oct 02 2013 15:47:28

%S 21,411,111,1111,11111,2111111,1111111,211111111,2111111111,

%T 21111111111,11111111111,4111111111111,121111111111111,

%U 511111111111111,2111111111111111,81111111111111111,11111111111111111

%N Smallest semiprime ending in exactly n 1's.

%e a(2)=411 is a term because 411 is the smallest semiprime ending in exactly two 1's.

%K base,nonn

%O 1,1

%A _Shyam Sunder Gupta_, May 12 2005