Cubes using only digits 1, 2, 3, 5 and 7.

Terms

a(0) =1a(1) =27a(2) =125a(3) =512a(4) =1331a(5) =3375a(6) =753571a(7) =2571353a(8) =5177717a(9) =17173512a(10) =25153757a(11) =72511713a(12) =11512557512a(13) =22211737731a(14) =27135225125a(15) =125375375125a(16) =552377215125