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

Terms

a(0) =2a(1) =5a(2) =7a(3) =13a(4) =43a(5) =47a(6) =67a(7) =97a(8) =113a(9) =137a(10) =167a(11) =173a(12) =197a(13) =277a(14) =307a(15) =397a(16) =463a(17) =467a(18) =557a(19) =607a(20) =617a(21) =887a(22) =1063a(23) =1153a(24) =1217a(25) =1237a(26) =1307a(27) =1373a(28) =1427a(29) =1453