Primes having only {6, 7, 8, 9} as digits.

Terms

a(0) =7a(1) =67a(2) =79a(3) =89a(4) =97a(5) =677a(6) =769a(7) =787a(8) =797a(9) =877a(10) =887a(11) =967a(12) =977a(13) =997a(14) =6679a(15) =6689a(16) =6779a(17) =6869a(18) =6899a(19) =6967a(20) =6977a(21) =6997a(22) =7669a(23) =7687a(24) =7699a(25) =7789a(26) =7867a(27) =7877a(28) =7879a(29) =8669