They are both prime numbers with only two factors each
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6 and 12, among others.
The GCF of 13 and 24 is 1.The GCF is 1.
The least common multiple of the numbers 13 and 17 is 221.
The common denominator is usually the Lowest (or Least) Common Multiple of the numbers involved. Where two numbers have no common factors then the LCM is simply the product of those numbers. As 19 is a prime number and has no factors in common with 18 then the common denominator is 18 x 19 = 342.
12 and 24