Numbers k such that string 8,9 occurs in the base 10 representation of k but not of k+1.

Terms

a(0) =89a(1) =189a(2) =289a(3) =389a(4) =489a(5) =589a(6) =689a(7) =789a(8) =899a(9) =989a(10) =1089a(11) =1189a(12) =1289a(13) =1389a(14) =1489a(15) =1589a(16) =1689a(17) =1789a(18) =1899a(19) =1989a(20) =2089a(21) =2189a(22) =2289a(23) =2389a(24) =2489a(25) =2589a(26) =2689a(27) =2789a(28) =2899a(29) =2989