%I
%S 7,71,719,7193,71933,719333
%N a(n) = smallest ndigit prime formed by appending a digit to a(n1); a(1) = 7.
%C There is no prime a(7) since 7193331,7193333,7193337,7193339 are not prime.
%C These are the first 6 entries of A048552.  R. J. Mathar, Oct 15 2011
%e a(1)=7
%e a(2)=71
%e a(3)=719
%e a(4)=7193
%e a(5)=71933
%e a(6)=719333
%K nonn,base,fini,full
%O 1,1
%A _Jorge Coveiro_, Jan 10 2005
%E Edited by _Charles R Greathouse IV_, Aug 02 2010
