Digit '8' concatenated with a(n) is a prime.

Terms

a(0) =3a(1) =9a(2) =11a(3) =21a(4) =23a(5) =27a(6) =29a(7) =39a(8) =53a(9) =57a(10) =59a(11) =63a(12) =77a(13) =81a(14) =83a(15) =87a(16) =101a(17) =111a(18) =117a(19) =123a(20) =147a(21) =161a(22) =167a(23) =171a(24) =179a(25) =191a(26) =209a(27) =219a(28) =221a(29) =231