A043143 Numbers n such that 2 and 4 occur juxtaposed in the base 7 representation of n but not of n-1.

18, 30, 67, 79, 116, 126, 165, 177, 210, 226, 263, 275, 312, 324, 361, 373, 410, 422, 459, 469, 508, 520, 553, 569, 606, 618, 655, 667, 704, 716, 753, 765, 802, 812, 851, 863, 882, 949, 961, 998, 1010, 1047, 1059, 1096, 1108