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1, 3, 5, 9, 15, 45 -1, -3, -5, -9, -15, -45
As a product of its prime factors it is: 3*5 = 15 Or as: 1*15 = 15
2/5 x 15/18 = 1/3
15
As a product of its prime factors: 3 times 5 = 15