Răspuns:
71-= 1,71
72 = 1,2,3,8,9,36
73= 1,73
74= 1,2,74
75 =1 ,3,,5, 15,25,75
76= 1,2,4,19,76
77= 1,7,11,77
78= 1,2,3,6,13,26,39,78
79= 1,79
80= 1,2,4,5,8,10,20,40,80
81 = 1,3,9,27,81
82= 1,2,82
83=1,83
84= 1,2,3,4,6,7,12 ,14,21,28,42,84
85= 1,5,17,85
86=1,2,86
87=1,3,29,87
88=1,2,4,8,22,44,88
89=1,89
90= 1,2,3,5,6,9,15,18,30,45,90
