like someone said its a potato number that made me MAD
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The greatest common factor of a prime number & a composite number is 1 if the composite number is not divisible by the prime number. 81(composite number) is not divisible by 29(prime number) so, gcf(29,81) = 1.
A composite number has three or more factors.
17 is not composite
297 is composite.
17 has no composite factors.