Numbers k such that 4 and 5 occur juxtaposed in the base-9 representation of k but not of k-1.

Terms

a(0) =41a(1) =49a(2) =122a(3) =130a(4) =203a(5) =211a(6) =284a(7) =292a(8) =365a(9) =369a(10) =441a(11) =454a(12) =527a(13) =535a(14) =608a(15) =616a(16) =689a(17) =697a(18) =770a(19) =778a(20) =851a(21) =859a(22) =932a(23) =940a(24) =1013a(25) =1021a(26) =1094a(27) =1098a(28) =1170a(29) =1183