Numbers whose Collatz trajectories cross their initial values a record number of times.

Terms

a(0) =1a(1) =3a(2) =6a(3) =9a(4) =14a(5) =18a(6) =33a(7) =54a(8) =97a(9) =129a(10) =194a(11) =257a(12) =294a(13) =313a(14) =342a(15) =353a(16) =398a(17) =417a(18) =470a(19) =626a(20) =9225a(21) =13739a(22) =14473a(23) =19297a(24) =27681a(25) =38881a(26) =112782a(27) =283261a(28) =427762a(29) =506977