Numbers k such that 5 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.

Terms

a(0) =58a(1) =85a(2) =158a(3) =185a(4) =258a(5) =285a(6) =358a(7) =385a(8) =458a(9) =485a(10) =558a(11) =580a(12) =658a(13) =685a(14) =758a(15) =785a(16) =850a(17) =885a(18) =958a(19) =985a(20) =1058a(21) =1085a(22) =1158a(23) =1185a(24) =1258a(25) =1285a(26) =1358a(27) =1385a(28) =1458a(29) =1485