Cubes whose digits are all odd.

Terms

a(0) =1a(1) =1331a(2) =3375a(3) =35937a(4) =59319a(5) =357911a(6) =753571a(7) =5177717a(8) =5359375a(9) =5735339a(10) =9393931a(11) =17373979a(12) =37595375a(13) =37159393753a(14) =99317171591a(15) =175333911173a(16) =397551775977