Odd numbers k such that rad(k) divides sigma(k).

Terms

a(0) =1a(1) =135a(2) =891a(3) =1521a(4) =3375a(5) =5733a(6) =10935a(7) =11907a(8) =41067a(9) =43875a(10) =84375a(11) =89667a(12) =92781a(13) =98865a(14) =107811a(15) =108927a(16) =154791a(17) =185625a(18) =200655a(19) =216513a(20) =226233a(21) =273375a(22) =274625a(23) =287469a(24) =307125a(25) =336141a(26) =416745a(27) =448335a(28) =480249a(29) =544635