Numbers n such that n+cototient(n) is a power of 2.

Terms

a(0) =1a(1) =3a(2) =7a(3) =10a(4) =20a(5) =31a(6) =40a(7) =80a(8) =127a(9) =160a(10) =320a(11) =322a(12) =640a(13) =644a(14) =1280a(15) =1288a(16) =2560a(17) =2576a(18) =5120a(19) =5152a(20) =8191a(21) =10240a(22) =10304a(23) =20480a(24) =20608a(25) =40960a(26) =41216a(27) =81920a(28) =82432a(29) =131071