The factor pairs of 260 are (260,1), (130,2), (65,4), (52,5), (26,10), and (20,13)
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No. 255 is an odd number.
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).
The factor pairs of 215 are 1, 5, 43, and 215