Primes having only {3, 4, 9} as digits.

Terms

a(0) =3a(1) =43a(2) =349a(3) =433a(4) =439a(5) =443a(6) =449a(7) =499a(8) =3343a(9) =3433a(10) =3449a(11) =3499a(12) =3943a(13) =4339a(14) =4349a(15) =4493a(16) =4933a(17) =4943a(18) =4993a(19) =4999a(20) =9343a(21) =9349a(22) =9433a(23) =9439a(24) =9949a(25) =33343a(26) =33349a(27) =33493a(28) =34439a(29) =34499