A044565 Numbers n such that string 6,4 occurs in the base 7 representation of n but not of n+1.

46, 95, 144, 193, 242, 291, 328, 340, 389, 438, 487, 536, 585, 634, 671, 683, 732, 781, 830, 879, 928, 977, 1014, 1026, 1075, 1124, 1173, 1222, 1271, 1320, 1357, 1369, 1418, 1467, 1516, 1565, 1614, 1663, 1700, 1712, 1761, 1810