Numbers n such that string 4,0 occurs in the base 9 representation of n but not of n-1.

Terms

a(0) =36a(1) =117a(2) =198a(3) =279a(4) =324a(5) =360a(6) =441a(7) =522a(8) =603a(9) =684a(10) =765a(11) =846a(12) =927a(13) =1008a(14) =1053a(15) =1089a(16) =1170a(17) =1251a(18) =1332a(19) =1413a(20) =1494a(21) =1575a(22) =1656a(23) =1737a(24) =1782a(25) =1818a(26) =1899a(27) =1980a(28) =2061a(29) =2142