Prime numbers don't have proper factors.
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73 is a prime number. It's only factors are 1 and 73. The only common factor of 73 and 40 is 1.
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.
You need at least two numbers to find a GCF. The good news is 73 is prime so any number you compare it with, if it's not a multiple of 73, the GCF will be one.
Factors for 949 are: 1, 13, 73, 949
The GCF of a prime number and a composite number is 1 if the former is not a factor of the latter. 73 is a prime number and 18 is a composite number and 73 is not a factor of 18 because 18 is not divisible by 73. So, GCF(73, 18) = 1.