363,1
121,3
33,11
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The factor pairs of 51 are (1,51) and (17,3)
Single numbers don't have LCMs, much less pairs of them. Pairs of LCMs don't exist because only one number can be least. Other than that...The factor pairs of 36 are (36,1)(18,2)(12,3)(9,4)(6,6)
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