Prime numbers having no additional odd primes in their Collatz (3x+1) trajectory.

Terms

a(0) =2a(1) =5a(2) =113a(3) =227a(4) =2417a(5) =3637a(6) =7253a(7) =14549a(8) =14563a(9) =30559a(10) =38677a(11) =38833a(12) =155333a(13) =206923a(14) =207121a(15) =217309a(16) =464213a(17) =466033a(18) =620771a(19) =827693a(20) =915737a(21) =1100149a(22) =1100353a(23) =1220983a(24) =1303873a(25) =1472893a(26) =1656901a(27) =1963813a(28) =2327483a(29) =2475797