Numbers whose base-7 representation contains exactly three 0's.

Terms

a(0) =343a(1) =686a(2) =1029a(3) =1372a(4) =1715a(5) =2058a(6) =2402a(7) =2403a(8) =2404a(9) =2405a(10) =2406a(11) =2407a(12) =2408a(13) =2415a(14) =2422a(15) =2429a(16) =2436a(17) =2443a(18) =2450a(19) =2499a(20) =2548a(21) =2597a(22) =2646a(23) =2695a(24) =2744a(25) =3087a(26) =3430a(27) =3773a(28) =4116a(29) =4459