Smallest prime that concatenated with all previous terms of sequence forms a prime.

Terms

a(0) =2a(1) =3a(2) =3a(3) =3a(4) =3a(5) =23a(6) =7a(7) =3a(8) =53a(9) =19a(10) =149a(11) =571a(12) =3a(13) =131a(14) =3a(15) =151a(16) =389a(17) =31a(18) =389a(19) =97a(20) =59a(21) =277a(22) =491a(23) =181a(24) =59a(25) =67a(26) =647a(27) =1117a(28) =797a(29) =433