%I A109612
%S A109612 3,9,21,23,41,47,51,57,63,81
%N A109612 Numbers n such that the string 44n is prime.
%e A109612 If n=3 then 44n = 443 which is a prime.
%e A109612 If n=81 then 44n = 4481 which is a prime.
%Y A109612 Sequence in context: A146219 A128127 A006077 this_sequence A032668 A050839 
               A032640
%Y A109612 Adjacent sequences: A109609 A109610 A109611 this_sequence A109613 A109614 
               A109615
%K A109612 nonn
%O A109612 1,1
%A A109612 Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 30 2005