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

Terms

a(0) =5a(1) =59a(2) =569a(3) =599a(4) =659a(5) =5569a(6) =5659a(7) =5669a(8) =6569a(9) =6599a(10) =6659a(11) =6959a(12) =56569a(13) =56599a(14) =56659a(15) =56999a(16) =59659a(17) =59669a(18) =59699a(19) =59999a(20) =65599a(21) =65699a(22) =66569a(23) =66959a(24) =69959a(25) =95569a(26) =95959a(27) =96959a(28) =99559a(29) =556559