Squares k such that phi(k) is a cube.

Terms

a(0) =1a(1) =16a(2) =1024a(3) =2500a(4) =5184a(5) =50625a(6) =65536a(7) =160000a(8) =331776a(9) =810000a(10) =3779136a(11) =4194304a(12) =4691556a(13) =5345344a(14) =7001316a(15) =10240000a(16) =16867449a(17) =20820969a(18) =21233664a(19) =27060804a(20) =36905625a(21) =39062500a(22) =51840000a(23) =52200625a(24) =228765625a(25) =241864704a(26) =268435456a(27) =269879184a(28) =300259584a(29) =333135504