Numbers k such that 0 and 3 occur juxtaposed in the base-9 representation of k but not of k-1.

Terms

a(0) =27a(1) =84a(2) =108a(3) =165a(4) =189a(5) =243a(6) =270a(7) =327a(8) =351a(9) =408a(10) =432a(11) =489a(12) =513a(13) =570a(14) =594a(15) =651a(16) =675a(17) =732a(18) =756a(19) =813a(20) =837a(21) =894a(22) =918a(23) =972a(24) =999a(25) =1056a(26) =1080a(27) =1137a(28) =1161a(29) =1218