A032995 If d,e are consecutive digits of n in base 7, then |d-e|>=5.

1, 2, 3, 4, 5, 6, 13, 35, 42, 43, 91, 92, 250, 251, 299, 300, 307, 642, 643, 650, 1750, 1757, 1758, 2093, 2100, 2101, 2149, 2150, 4494, 4501, 4502, 4550, 4551, 12255, 12256, 12304, 12305, 12312, 14656, 14657, 14705, 14706, 14713