Primes that remain prime through 3 iterations of the function f(x) = 2*x + 1.

Terms

a(0) =2a(1) =5a(2) =89a(3) =179a(4) =359a(5) =509a(6) =1229a(7) =1409a(8) =2699a(9) =3539a(10) =6449a(11) =10589a(12) =11549a(13) =11909a(14) =12119a(15) =17159a(16) =19709a(17) =19889a(18) =22349a(19) =26189a(20) =27479a(21) =30389a(22) =43649a(23) =53639a(24) =53849a(25) =55229a(26) =57839a(27) =60149a(28) =61409a(29) =63419