Primes that remain prime through 2 iterations of function f(x) = 9x + 8.

Terms

a(0) =7a(1) =11a(2) =19a(3) =61a(4) =97a(5) =107a(6) =131a(7) =181a(8) =251a(9) =271a(10) =397a(11) =401a(12) =419a(13) =467a(14) =557a(15) =601a(16) =677a(17) =727a(18) =907a(19) =929a(20) =1129a(21) =1297a(22) =1439a(23) =1481a(24) =1609a(25) =1699a(26) =1747a(27) =1901a(28) =1931a(29) =2027