The Collatz iteration of these primes produces only even numbers, primes and 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =17a(7) =19a(8) =29a(9) =37a(10) =53a(11) =59a(12) =67a(13) =89a(14) =101a(15) =131a(16) =149a(17) =157a(18) =179a(19) =181a(20) =197a(21) =241a(22) =269a(23) =277a(24) =349a(25) =397a(26) =739a(27) =853a(28) =1109a(29) =1237