Numbers k such that 0 and 3 occur juxtaposed in the base-10 representation of k but not of k+1.

Terms

a(0) =30a(1) =103a(2) =130a(3) =203a(4) =230a(5) =309a(6) =330a(7) =403a(8) =430a(9) =503a(10) =530a(11) =603a(12) =630a(13) =703a(14) =730a(15) =803a(16) =830a(17) =903a(18) =930a(19) =1003a(20) =1039a(21) =1103a(22) =1130a(23) =1203a(24) =1230a(25) =1309a(26) =1330a(27) =1403a(28) =1430a(29) =1503