Primes having only {0, 3, 4, 7} as digits.

Terms

a(0) =3a(1) =7a(2) =37a(3) =43a(4) =47a(5) =73a(6) =307a(7) =337a(8) =347a(9) =373a(10) =433a(11) =443a(12) =733a(13) =743a(14) =773a(15) =3037a(16) =3307a(17) =3343a(18) =3347a(19) =3373a(20) =3407a(21) =3433a(22) =3733a(23) =4003a(24) =4007a(25) =4073a(26) =4337a(27) =4373a(28) =4447a(29) =4703