Least k such that the Collatz (3x+1) iteration starting with k has "dropping time" A122437(n).

Terms

a(0) =2a(1) =5a(2) =3a(3) =11a(4) =7a(5) =39a(6) =287a(7) =231a(8) =191a(9) =127a(10) =359a(11) =511a(12) =239a(13) =159a(14) =639a(15) =283a(16) =991a(17) =251a(18) =167a(19) =111a(20) =1695a(21) =1307a(22) =871a(23) =927a(24) =671a(25) =155a(26) =103a(27) =1639a(28) =91a(29) =3431