%I A069606
%S A069606 4,1,9,11,19,3,3,41,51,51,87,19,63,23,13,29,3,219,183,27,27,3,3,27,217,
%T A069606 129,381,59,163,281,169,57,77,31,9,9,243,147,21,239,39,219,693,37,143,
%U A069606 789,9,163,219,497,51,301,149,103,117,309,591,159,741,131,541,1377,207
%N A069606 a(1) = 4; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) 
               is a prime.
%e A069606 a(5) = 19 and the number 4191119 is a prime.
%t A069606 a[1] = 4; a[n_] := a[n] = Block[{k = 1, c = IntegerDigits @ Table[ a[i], 
               {i, n - 1}]}, While[ !PrimeQ[ FromDigits @ Flatten @ Append[c, IntegerDigits[k]]], 
               k += 2]; k]; Table[ a[n], {n, 63}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), 
               Aug 05 2005)
%Y A069606 Cf. A069602, A069604, A046254, A074340, A092528, A069603, A069605, A069606, 
               A069607, A069608, A069609, A069610, A069611, A111525.
%Y A069606 Sequence in context: A067015 A158199 A091885 this_sequence A001254 A075150 
               A143763
%Y A069606 Adjacent sequences: A069603 A069604 A069605 this_sequence A069607 A069608 
               A069609
%K A069606 nonn,base
%O A069606 1,1
%A A069606 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 26 2002
%E A069606 More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jun 13 2002