A033012 Every run of digits of n in base 14 has length 2.

15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 2940, 2970, 2985, 3000, 3015, 3030, 3045, 3060, 3075, 3090, 3105, 3120, 3135, 5880, 5895, 5925, 5940, 5955, 5970, 5985, 6000, 6015, 6030, 6045, 6060, 6075, 8820