Numbers n such that the trajectory of n under the "3x+1" map reaches n+1.

Terms

a(0) =3a(1) =7a(2) =9a(3) =15a(4) =19a(5) =25a(6) =33a(7) =39a(8) =51a(9) =91a(10) =121a(11) =159a(12) =166a(13) =183a(14) =243a(15) =250a(16) =333a(17) =376a(18) =411a(19) =432a(20) =487a(21) =501a(22) =649a(23) =667a(24) =865a(25) =889a(26) =975a(27) =1153a(28) =1185a(29) =1299