Two multiples of any number greater than one can't be co-prime. They would always have that number as a common factor.
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Multiples of 13, like 13, 26 and 39.
Multiples of 13 have 13 as a factor. 13, 26, 39 and so on.
The prime numbers: 2, 3, 5, 7, 11, 13, 17, 19
'26' has only two factors, they are '2' & '13' ; 2 x 13 = 26 or 13 x 2 = 26 Both '2' and '13' are prime numbers.
The multiples of 13 are numbers that can be divided by 13 without leaving a remainder. The multiples of 13 are: 13, 26, 39, 52, 65, 78, 91, 104, 117, and so on. The multiples of 7 are numbers that can be divided by 7 without leaving a remainder. The multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, and so on.