The sum of the totatives of n is a perfect cube.

Terms

a(0) =1a(1) =2a(2) =9a(3) =16a(4) =36a(5) =128a(6) =200a(7) =243a(8) =288a(9) =289a(10) =450a(11) =972a(12) =1024a(13) =1156a(14) =1600a(15) =2304a(16) =3600a(17) =6561a(18) =7776a(19) =8192a(20) =8214a(21) =8664a(22) =9126a(23) =9248a(24) =10584a(25) =12150a(26) =12800a(27) =14450a(28) =15987a(29) =18432