A044537 Numbers n such that string 2,4 occurs in the base 7 representation of n but not of n+1.

18, 67, 116, 132, 165, 214, 263, 312, 361, 410, 459, 475, 508, 557, 606, 655, 704, 753, 802, 818, 851, 930, 949, 998, 1047, 1096, 1145, 1161, 1194, 1243, 1292, 1341, 1390, 1439, 1488, 1504, 1537, 1586, 1635, 1684, 1733, 1782