Primes having only {5, 7, 8} as digits.

Terms

a(0) =5a(1) =7a(2) =557a(3) =577a(4) =587a(5) =757a(6) =787a(7) =857a(8) =877a(9) =887a(10) =5557a(11) =5857a(12) =7577a(13) =7757a(14) =7877a(15) =8887a(16) =55787a(17) =57557a(18) =57587a(19) =57787a(20) =58757a(21) =58787a(22) =75557a(23) =75577a(24) =75787a(25) =77557a(26) =77587a(27) =78577a(28) =78787a(29) =78857