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Anonymous
Factors of 81 in pairs: 1 x 81, 3 x 27, 9 x 9
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1 x 7931, 7 x 1133, 11 x 721, 77 x 103
There are 6,750 such numbers.
(143,3)(39,11)(33,13)
When two numbers have a GCF of 1, their product will be their LCM.
-6 and -9
2 and 4