Numbers k such that 5 and 9 occur juxtaposed in the base-10 representation of k but not of k+1.

Terms

a(0) =59a(1) =95a(2) =159a(3) =195a(4) =259a(5) =295a(6) =359a(7) =395a(8) =459a(9) =495a(10) =559a(11) =599a(12) =659a(13) =695a(14) =759a(15) =795a(16) =859a(17) =895a(18) =959a(19) =995a(20) =1059a(21) =1095a(22) =1159a(23) =1195a(24) =1259a(25) =1295a(26) =1359a(27) =1395a(28) =1459a(29) =1495