Smallest term x from A066669 such that phi(x) = 2^n times some prime.

Terms

a(0) =7a(1) =13a(2) =35a(3) =65a(4) =97a(5) =193a(6) =485a(7) =769a(8) =1649a(9) =3281a(10) =8245a(11) =12289a(12) =24929a(13) =49601a(14) =124645a(15) =197633a(16) =423793a(17) =786433a(18) =2118965a(19) =3158273a(20) =6357089a(21) =12648641a(22) =31785445a(23) =50397953a(24) =108070513a(25) =202113281a(26) =540352565a(27) =805384193a(28) =1633771873a(29) =3221225473