Numbers k such that 3 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.

Terms

a(0) =38a(1) =83a(2) =138a(3) =183a(4) =238a(5) =283a(6) =338a(7) =380a(8) =438a(9) =483a(10) =538a(11) =583a(12) =638a(13) =683a(14) =738a(15) =783a(16) =830a(17) =883a(18) =938a(19) =983a(20) =1038a(21) =1083a(22) =1138a(23) =1183a(24) =1238a(25) =1283a(26) =1338a(27) =1380a(28) =1438a(29) =1483