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

Terms

a(0) =19a(1) =373a(2) =607a(3) =1171a(4) =1381a(5) =1867a(6) =2137a(7) =2539a(8) =3181a(9) =4021a(10) =5689a(11) =5827a(12) =5857a(13) =6163a(14) =7213a(15) =7507a(16) =11497a(17) =12007a(18) =13291a(19) =13687a(20) =14173a(21) =15193a(22) =16453a(23) =21997a(24) =22501a(25) =24799a(26) =25657a(27) =28723a(28) =31393a(29) =31957