Numbers k such that d(phi(k)) = phi(d(k)), where d=A000005 and phi=A000010.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =16a(5) =24a(6) =30a(7) =36a(8) =64a(9) =384a(10) =408a(11) =480a(12) =510a(13) =1024a(14) =1296a(15) =1560a(16) =1680a(17) =2304a(18) =2640a(19) =3480a(20) =4096a(21) =5440a(22) =5520a(23) =6360a(24) =9240a(25) =11280a(26) =14040a(27) =14160a(28) =14400a(29) =15120