Пошаговое объяснение:
78=1, 2, 3, 6, 13, 26, 39, 78
80=1, 2, 4, 5, 8, 10, 16, 20, 40, 80
81=1, 3, 9, 27, 81
82=1, 2, 41, 82
84=1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
85=1, 5, 17, 85
87=1, 3, 29, 87
