%I A104146
%S A104146 1,3,1,1,3,1,1,147,17,1,3,7,1,297,1
%N A104146 Smallest k>0 such that n*10^k + k is prime.
%C A104146 (a(n) mod 10) in {1,3,7,9}.
%C A104146 a(16), if it exists, is greater than 20000. - Ryan Propper (rpropper(AT)stanford.edu), 
               Jul 21 2006
%C A104146 a(16), if it exists, is greater than 42000. - Ryan Propper (rpropper(AT)stanford.edu), 
               Sep 25 2006
%Y A104146 a(floor(A030430(n)/10)) = 1.
%Y A104146 Sequence in context: A091840 A083985 A109848 this_sequence A133705 A046111 
               A131779
%Y A104146 Adjacent sequences: A104143 A104144 A104145 this_sequence A104147 A104148 
               A104149
%K A104146 nonn,more
%O A104146 1,2
%A A104146 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 07 2005