Smallest nontrivial extension of n which is prime.

Terms

a(0) =11a(1) =23a(2) =31a(3) =41a(4) =53a(5) =61a(6) =71a(7) =83a(8) =97a(9) =101a(10) =113a(11) =127a(12) =131a(13) =149a(14) =151a(15) =163a(16) =173a(17) =181a(18) =191a(19) =2003a(20) =211a(21) =223a(22) =233a(23) =241a(24) =251a(25) =263a(26) =271a(27) =281a(28) =293a(29) =307