There are 3 factor pairs of 245:
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225,175,345,525,915,15
Divide 245 by 1, 5 and 7.
The factor pairs of 51 are (1,51) and (17,3)
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
The factor pairs of 98 are (1,98), (2,49), and (7,14).