7-smooth numbers containing only noncomposite digits (1,2,3,5,7).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =12a(6) =15a(7) =21a(8) =25a(9) =27a(10) =32a(11) =35a(12) =72a(13) =75a(14) =112a(15) =125a(16) =135a(17) =175a(18) =225a(19) =252a(20) =315a(21) =375a(22) =512a(23) =525a(24) =735a(25) =1125a(26) =1152a(27) =1215a(28) =1225a(29) =1323