Beat the Drum Beat!
If number positions as 1-8 then steady beats:
1, 2, 3, 4, 5, 6, 7, 8
1, 3, 5, 7 or starting anywhere but missing out one place each
time
1, 4 or again, starting anywhere but missing out three places each
time
If 12 places, could do:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
1, 3, 5, 7, 9, 11
1, 4, 7, 10
1, 5, 9
ie step in factors