2,19
38
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the factor rainbow of 4 is 1,2,4
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
The greatest common factor of 38 and 76 is 38.
The largest prime factor of 38 is 19.
43 is a prime number and doesn't have a rainbow because it only has one prime factor: itself.