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

Terms

a(0) =90a(1) =190a(2) =290a(3) =390a(4) =490a(5) =590a(6) =690a(7) =790a(8) =890a(9) =909a(10) =990a(11) =1090a(12) =1190a(13) =1290a(14) =1390a(15) =1490a(16) =1590a(17) =1690a(18) =1790a(19) =1890a(20) =1909a(21) =1990a(22) =2090a(23) =2190a(24) =2290a(25) =2390a(26) =2490a(27) =2590a(28) =2690a(29) =2790