280 = 1 x 280
280 = 2 x 140
280 = 4 x 70
280 = 5 x 56
280 = 7 x 40
280 = 8 x 35
280 = 10 x 28
280 = 14 x 20
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1 and 28, 2 and 14, 4 and 7.
6 (-7)x(-4) (7)x(4) (1)x(28) (-1)x(-28) (2)x(14) (-2)x(-14)
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
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.