Primes that remain prime through 3 iterations of function f(x) = 2x + 5.

Terms

a(0) =13a(1) =31a(2) =37a(3) =67a(4) =73a(5) =181a(6) =367a(7) =541a(8) =661a(9) =997a(10) =1087a(11) =1117a(12) =1327a(13) =1861a(14) =2179a(15) =2293a(16) =2473a(17) =2713a(18) =2719a(19) =3271a(20) =3727a(21) =4363a(22) =5281a(23) =5443a(24) =5749a(25) =7459a(26) =8089a(27) =8707a(28) =9109a(29) =9181