Numbers n such that string 4,7 occurs in the base 9 representation of n but not of n-1.

Terms

a(0) =43a(1) =124a(2) =205a(3) =286a(4) =367a(5) =387a(6) =448a(7) =529a(8) =610a(9) =691a(10) =772a(11) =853a(12) =934a(13) =1015a(14) =1096a(15) =1116a(16) =1177a(17) =1258a(18) =1339a(19) =1420a(20) =1501a(21) =1582a(22) =1663a(23) =1744a(24) =1825a(25) =1845a(26) =1906a(27) =1987a(28) =2068a(29) =2149