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

Terms

a(0) =98a(1) =198a(2) =298a(3) =398a(4) =498a(5) =598a(6) =698a(7) =798a(8) =898a(9) =989a(10) =998a(11) =1098a(12) =1198a(13) =1298a(14) =1398a(15) =1498a(16) =1598a(17) =1698a(18) =1798a(19) =1898a(20) =1989a(21) =1998a(22) =2098a(23) =2198a(24) =2298a(25) =2398a(26) =2498a(27) =2598a(28) =2698a(29) =2798