Numbers n such that string 2,8 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =28a(1) =128a(2) =228a(3) =280a(4) =328a(5) =428a(6) =528a(7) =628a(8) =728a(9) =828a(10) =928a(11) =1028a(12) =1128a(13) =1228a(14) =1280a(15) =1328a(16) =1428a(17) =1528a(18) =1628a(19) =1728a(20) =1828a(21) =1928a(22) =2028a(23) =2128a(24) =2228a(25) =2280a(26) =2328a(27) =2428a(28) =2528a(29) =2628