7-smooth numbers: positive numbers whose prime divisors are all <= 7.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =12a(11) =14a(12) =15a(13) =16a(14) =18a(15) =20a(16) =21a(17) =24a(18) =25a(19) =27a(20) =28a(21) =30a(22) =32a(23) =35a(24) =36a(25) =40a(26) =42a(27) =45a(28) =48a(29) =49