Primes that remain prime through 3 iterations of function f(x) = 9x + 8.

Terms

a(0) =11a(1) =61a(2) =251a(3) =397a(4) =467a(5) =727a(6) =907a(7) =1747a(8) =1901a(9) =2221a(10) =2617a(11) =3121a(12) =3527a(13) =3581a(14) =4001a(15) =4099a(16) =4211a(17) =4759a(18) =5231a(19) =5717a(20) =6277a(21) =6661a(22) =6689a(23) =7237a(24) =7877a(25) =8117a(26) =8171a(27) =8581a(28) =9371a(29) =9587