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

Terms

a(0) =1a(1) =3a(2) =119a(3) =357a(4) =2522a(5) =6305a(6) =6596a(7) =6604a(8) =7566a(9) =18915a(10) =19788a(11) =19812a(12) =20520a(13) =24347a(14) =24353a(15) =26068a(16) =26082a(17) =28126a(18) =47959a(19) =58520a(20) =64790a(21) =65205a(22) =70315a(23) =73041a(24) =73059a(25) =73636a(26) =75460a(27) =78204a(28) =84378a(29) =143877