Numbers n such that phi(n) - 1 | sigma(n).

Terms

a(0) =3a(1) =4a(2) =5a(3) =6a(4) =8a(5) =10a(6) =20a(7) =22a(8) =40a(9) =76a(10) =80a(11) =108a(12) =160a(13) =204a(14) =320a(15) =640a(16) =1072a(17) =1280a(18) =2560a(19) =4192a(20) =5120a(21) =10240a(22) =20480a(23) =40960a(24) =49344a(25) =81920a(26) =163840a(27) =327680a(28) =655360a(29) =1310720