Primes having only {4, 5, 6, 9} as digits.

Terms

a(0) =5a(1) =59a(2) =449a(3) =499a(4) =569a(5) =599a(6) =659a(7) =4549a(8) =4649a(9) =4969a(10) =4999a(11) =5449a(12) =5569a(13) =5659a(14) =5669a(15) =6449a(16) =6469a(17) =6569a(18) =6599a(19) =6659a(20) =6949a(21) =6959a(22) =9649a(23) =9949a(24) =44449a(25) =44549a(26) =44699a(27) =44959a(28) =45569a(29) =45599