Numbers n such that phi(n) = 2^bigomega(n).

Terms

a(0) =1a(1) =3a(2) =10a(3) =20a(4) =30a(5) =40a(6) =60a(7) =80a(8) =120a(9) =160a(10) =240a(11) =320a(12) =480a(13) =640a(14) =960a(15) =1280a(16) =1920a(17) =2560a(18) =3840a(19) =5120a(20) =7680a(21) =10240a(22) =15360a(23) =20480a(24) =30720a(25) =40960a(26) =61440a(27) =81920a(28) =122880a(29) =163840