Smallest number that requires n iterations of the unitary totient function (A047994) to reach 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =9a(6) =16a(7) =17a(8) =41a(9) =83a(10) =113a(11) =137a(12) =257a(13) =773a(14) =977a(15) =1657a(16) =2048a(17) =2313a(18) =4001a(19) =5725a(20) =7129a(21) =11117a(22) =17279a(23) =19897a(24) =22409a(25) =39283a(26) =43657a(27) =55457a(28) =120677a(29) =308941