Numbers k such that k * phi(k) is a cube.

Terms

a(0) =1a(1) =4a(2) =32a(3) =50a(4) =72a(5) =225a(6) =256a(7) =400a(8) =576a(9) =900a(10) =1944a(11) =2048a(12) =2166a(13) =2312a(14) =2646a(15) =3200a(16) =4107a(17) =4563a(18) =4608a(19) =5202a(20) =6075a(21) =6250a(22) =7200a(23) =7225a(24) =15125a(25) =15552a(26) =16384a(27) =16428a(28) =17328a(29) =18252