Primes having only {2, 5, 7, 8} as digits.

Terms

a(0) =2a(1) =5a(2) =7a(3) =227a(4) =257a(5) =277a(6) =557a(7) =577a(8) =587a(9) =727a(10) =757a(11) =787a(12) =827a(13) =857a(14) =877a(15) =887a(16) =2287a(17) =2557a(18) =2777a(19) =2857a(20) =2887a(21) =5227a(22) =5527a(23) =5557a(24) =5827a(25) =5857a(26) =7577a(27) =7727a(28) =7757a(29) =7877