Least k such that phi(k) has exactly n prime factors (counted with multiplicity).

Terms

a(0) =3a(1) =5a(2) =13a(3) =17a(4) =51a(5) =85a(6) =193a(7) =257a(8) =769a(9) =1285a(10) =3281a(11) =4369a(12) =12289a(13) =21845a(14) =49601a(15) =65537a(16) =196611a(17) =327685a(18) =786433a(19) =1114129a(20) =3158273a(21) =5570645a(22) =12648641a(23) =16843009a(24) =50397953a(25) =84215045a(26) =202113281a(27) =286331153a(28) =805384193a(29) =1431655765