It is because 7*11*13 = 1001.
so
abcabc = abc*1001 = abc*(7*11*13)
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abcabc=abc x 1001 1001 = 7 x 11 x 13 So such number as at least 4 prime factors: if abc is prime, then 4 factors only if abc is not prime then at least 4 factors
The factors of 13 are: 1, 13 The factors of 22 are: 1, 2, 11, 22 The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 33 are: 1, 3, 11, 33
3, 7, 11 and 13
As a product of its prime factors: 2*3*11*13*13 = 11154
No. 11 and 13 are factors of 143, 15 has no relation.