Primes having only {0, 4, 7, 8} as digits.

Terms

a(0) =7a(1) =47a(2) =487a(3) =787a(4) =877a(5) =887a(6) =4007a(7) =4447a(8) =4787a(9) =4877a(10) =7477a(11) =7487a(12) =7877a(13) =8087a(14) =8447a(15) =8707a(16) =8747a(17) =8807a(18) =8887a(19) =40087a(20) =40487a(21) =40787a(22) =40847a(23) =44087a(24) =44777a(25) =44887a(26) =47087a(27) =47407a(28) =47777a(29) =47807