The factor pairs of 51 are (1,51) and (17,3)
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Each of these factor pairs (multiply the numbers in parentheses) equals 52: (1, 52) (2, 26) (4, 13)
The factor pairs of 416 are 1 x 416, 2 x 208, 4 x 104, 8 x 52, 13 x 32, and 16 x 26
52 is not a factor of 325. 5 squared is a factor of 325.
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.
Here are pairs of numbers with 6 as their greatest common factor: 6, 18 12, 30 120, 126 306, 318 6 and 12