30:30,15,10,6,5,3,2,1
12:12,6,4,3,2,1
23:23,1
72:72,36,24,18,12,9,8,6,4,3,2,1
56-1,2,4,7,8,14,28,56.
30-1,2,3,5,6,10,15,30.
12-1,2,3,4,6,12.
72-1,2,3,4,6,8,9,12,18,24,36,72.
