Any odd number.
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Yes, 9 and 16 are relatively prime. They do not have any prime factors in common.
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
Prime numbers are those which are divisible only by 1 and the number itself... Example: 7 is divisible by no number other than 7 and 1. Relatively prime numbers are those pairs of numbers which have no common divisor other than one. Example: (15,16) Factors of 15:1,3,5,15 Factors of 16:1,4,16 Common factor of 15 & 16 is 1, hence 15 & 16 are relatively prime.
Infinitely many numbers are relatively prime to 37. Because 37 is a prime number, all other numbers are relatively prime to it.
Two numbers are relatively prime if their GCF is 1.