Analog of A006684 for the 5x+1 problem (cf. A133419).

Terms

a(0) =1a(1) =5a(2) =17a(3) =23a(4) =41a(5) =53a(6) =65a(7) =71a(8) =77a(9) =95a(10) =221a(11) =317a(12) =365a(13) =383a(14) =3317a(15) =3575a(16) =3605a(17) =6473a(18) =24125a(19) =31901a(20) =39965a(21) =44183a(22) =163733a(23) =317885a(24) =490541a(25) =519113a(26) =558365a(27) =602591a(28) =707735a(29) =753023