Numbers n such that string 0,9 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =109a(1) =209a(2) =309a(3) =409a(4) =509a(5) =609a(6) =709a(7) =809a(8) =909a(9) =1009a(10) =1099a(11) =1109a(12) =1209a(13) =1309a(14) =1409a(15) =1509a(16) =1609a(17) =1709a(18) =1809a(19) =1909a(20) =2009a(21) =2099a(22) =2109a(23) =2209a(24) =2309a(25) =2409a(26) =2509a(27) =2609a(28) =2709a(29) =2809