Numbers k such that 3 and 4 occur juxtaposed in the base-9 representation of k but not of k-1.

Terms

a(0) =31a(1) =39a(2) =112a(3) =120a(4) =193a(5) =201a(6) =274a(7) =279a(8) =351a(9) =363a(10) =436a(11) =444a(12) =517a(13) =525a(14) =598a(15) =606a(16) =679a(17) =687a(18) =760a(19) =768a(20) =841a(21) =849a(22) =922a(23) =930a(24) =1003a(25) =1008a(26) =1080a(27) =1092a(28) =1165a(29) =1173