Because 7 times 143 = 1001
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The positive factors of 1001 are: 1, 7, 11, 13, 77, 91, 143, 1001.
The factors of 1001 are 1, 7, 11, 13, 77, 91, 143, 1001. For them to be common, they need to be compared to another set of factors.
1, 7, 11, 13, 77, 91, 143, 1001.
It is because 7*11*13 = 1001. so abcabc = abc*1001 = abc*(7*11*13)
1001 has three prime factors. Each of these is of multiplicity one. In all, therefore it has 2*2*2 = 8 factors.