a(1) = 1; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.

Terms

a(0) =1a(1) =3a(2) =7a(3) =11a(4) =13a(5) =29a(6) =37a(7) =113a(8) =121a(9) =149a(10) =151a(11) =201a(12) =219a(13) =251a(14) =451a(15) =453a(16) =573a(17) =669a(18) =689a(19) =697a(20) =749a(21) =913a(22) =969a(23) =1157a(24) =1269a(25) =1503a(26) =1531a(27) =1809a(28) =2087a(29) =2163