Primes p that remain prime through 3 iterations of function f(x) = 6x - 1.

Terms

a(0) =239a(1) =269a(2) =439a(3) =569a(4) =599a(5) =829a(6) =1429a(7) =3389a(8) =6379a(9) =7159a(10) =7649a(11) =8779a(12) =8969a(13) =10799a(14) =10939a(15) =12919a(16) =13729a(17) =13879a(18) =15649a(19) =17159a(20) =18149a(21) =19379a(22) =21649a(23) =22669a(24) =23929a(25) =24799a(26) =25679a(27) =26849a(28) =28219a(29) =30389