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

Terms

a(0) =1a(1) =2a(2) =15a(3) =16a(4) =20a(5) =24a(6) =30a(7) =85a(8) =128a(9) =136a(10) =160a(11) =170a(12) =192a(13) =204a(14) =240a(15) =247a(16) =259a(17) =327a(18) =333a(19) =351a(20) =399a(21) =405a(22) =436a(23) =494a(24) =518a(25) =532a(26) =648a(27) =654a(28) =666a(29) =684