Primes that remain prime through 3 iterations of function f(x) = 10x + 9.

Terms

a(0) =13a(1) =139a(2) =293a(3) =331a(4) =547a(5) =967a(6) =1049a(7) =1399a(8) =1567a(9) =1889a(10) =1997a(11) =2087a(12) =2137a(13) =2309a(14) =2423a(15) =2437a(16) =2753a(17) =2939a(18) =3719a(19) =3761a(20) =3919a(21) =4451a(22) =4517a(23) =4621a(24) =6089a(25) =7001a(26) =7741a(27) =8423a(28) =8849a(29) =9437