Numbers such that 2*UnitaryPhi(2*UnitaryPhi(n)) = n.

Terms

a(0) =2a(1) =4a(2) =6a(3) =12a(4) =16a(5) =30a(6) =48a(7) =60a(8) =168a(9) =240a(10) =256a(11) =510a(12) =768a(13) =1020a(14) =3840a(15) =4080a(16) =14880a(17) =65280a(18) =65536a(19) =131070a(20) =196608a(21) =262140a(22) =983040a(23) =1048560a(24) =16711680a(25) =16776960a(26) =4294901760a(27) =4294967296a(28) =7608944640a(29) =8589934590