18:
1,2,3,6,9,18.
8:
1,2,4,8.
13:
1,13.
56:
1,2,4,7,8,14,28,56.
18
18,9,2,3,1
8
8,2,4,1
13
13,1
56
56,1,2,3,4,7,8,14,28
