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.
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2 and 3 are the first two prime numbers. The difference between them is 1
Any number greater than one can potentially be relatively prime with another.
The difference between two numbers is the result of a subtraction. This can be either positive or negative, depending on which number is greater.
43 and 17.
Infinitely many numbers are relatively prime to 37. Because 37 is a prime number, all other numbers are relatively prime to it.