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) =1a(2) =3a(3) =11a(4) =13a(5) =29a(6) =39a(7) =49a(8) =83a(9) =141a(10) =247a(11) =273a(12) =291a(13) =347a(14) =373a(15) =401a(16) =441a(17) =567a(18) =571a(19) =651a(20) =903a(21) =957a(22) =1001a(23) =1129a(24) =1401a(25) =1457a(26) =1467a(27) =1561a(28) =1889a(29) =2083