Numbers n such that string 4,5 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =45a(1) =145a(2) =245a(3) =345a(4) =445a(5) =450a(6) =545a(7) =645a(8) =745a(9) =845a(10) =945a(11) =1045a(12) =1145a(13) =1245a(14) =1345a(15) =1445a(16) =1450a(17) =1545a(18) =1645a(19) =1745a(20) =1845a(21) =1945a(22) =2045a(23) =2145a(24) =2245a(25) =2345a(26) =2445a(27) =2450a(28) =2545a(29) =2645