%I A050719
%S A050719 11,13,17,19,23,37,41,49,53,59,61,77,91,97,131,157,167,169,173,181,191,
%T A050719 193,197,211,227,239,259,307,311,319,323,337,349,371,379,413,419,427,
%U A050719 431,433,449,457,467,481,491,493,499,503,517,533,539,547,563,569,571
%N A050719 Inserting a digit '9' between adjacent digits of n makes a prime.
%e A050719 E.g. 181 becomes 1(9)8(9)1 which is prime 19891.
%Y A050719 Cf. A050674, A050711-A050718.
%Y A050719 Sequence in context: A038842 A046117 A091923 this_sequence A098415 A067283 
               A052259
%Y A050719 Adjacent sequences: A050716 A050717 A050718 this_sequence A050720 A050721 
               A050722
%K A050719 nonn,base
%O A050719 0,1
%A A050719 Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.