40 factor: 1, 2, 4, 5, 8, 10, 20, 40
41 factor: 1, 41
42 factors: 1, 2, 3, 6, 7, 14, 21, 42
43 factor: 1, 43
44 factor: 1, 2, 4, 11, 22, 44
45 factor: 1, 3, 5, 9, 15, 45
46 factor: 1, 2, 23, 46
47 factor: 1, 47
48 factor: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
49 factors: 1, 7, 49
50 factor: 1, 2, 5, 10, 25, 50
What are our 40~50 factors for this question?
To do this kind of problem is actually very simple, 40~50 factors, 40, 41,42, 43, 44, 45, 46. Numbers between 47,48,49,50 are all right, it is very simple to do this kind of problem, 40 to 50 of the factors, any number is a factor. To do this kind of problem, we should do according to this method. It's very simple.