In order for two numbers to be relatively prime (or co-prime), they must have no factors in common greater than 1. The prime factorization of 15 is 3*5, so any number that doesn't have a factor of 3 or 5 is relatively prime to 15. So 2 is relatively prime to 15..
Keeping this in consideration, what numbers are relatively prime to 16?
The number 15 is relatively prime to 16, but neither 15 nor 16 is prime. By definition, two numbers are relatively prime if and only if the greatest common divisor of both numbers is 1.
Subsequently, question is, what is relatively prime numbers and example? Two integers are relatively prime (or coprime) if there is no integer greater than one that divides them both (that is, their greatest common divisor is one). For example, 12 and 13 are relatively prime, but 12 and 14 are not.
Secondly, is 15 and 21 relatively prime?
As specific examples, 14 and 15 are coprime, being commonly divisible only by 1, while 14 and 21 are not coprime, because they are both divisible by 7. be used to indicate that a and b are relatively prime and that the term "prime" be used instead of coprime (as in a is prime to b).
Is 42 and 77 relatively prime?
7 is the number which divides 42 and 77 both. Therefore, they are not relatively prime. Since, there is no number greater than 1, which divides both the numbers. So, they are relatively prime numbers.
Related Question Answers
Is 0 relatively prime to any number?
Zero is not defined to be not relatively prime with any integer. It just so happens that it is divisible by any integer.Is 41 a prime number?
All numbers that end in five are divisible by five. Therefore all numbers that end with five and are greater than five are composite numbers. The prime numbers between 2 and 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.Are 16 and 27 relatively prime?
Relative prime are the numbers which dont share any of there factors. but still they dont share any of there prime cofactors as you can see there factors are different, so they are called as relatively prime. following are the some example of relatively prime numbers . (27,8), (21, 16) , ( 28, 45).Is 211 a prime number?
For 211, the answer is: yes, 211 is a prime number because it has only two distinct divisors: 1 and itself (211). As a consequence, 211 is only a multiple of 1 and 211.Are 8 and 3 relatively prime?
Describes two numbers for which the only common factor is 1. In other words, relatively prime numbers have a greatest common factor (gcf) of 1. For example, 6 and 35 are relatively prime (gcf = 1). The numers 6 and 8 are not relatively prime (gcf = 2).Is 9 and 21 relatively prime?
Two positive integers are relatively prime if the only integer that divides them both is 1. For example 9 and 20 are relatively prime since they have no common factor except 1. On the other hand 9 and 21 are not relatively prime since 3 divided both 9 and 21.Is 2 a prime number?
Yes, 2 is a prime number. Indeed, the definition of a prime numbers is to have only two distinct positive divisors, 1 and itself. A number is a divisor of another number when the remainder of Euclid's division of the second one by the first one is zero. 2 is the only even prime number.Is 1 a prime number?
Proof: The definition of a prime number is a positive integer that has exactly two positive divisors. However, 1 only has one positive divisor (1 itself), so it is not prime.What is the GCF of 20 and 72?
The gcf of 20 and 72 is 4.Are 13 and 19 prime to each other?
evenly. The first 25 prime numbers (all the prime numbers less than 100) are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 (sequence A000040 in the OEIS). Therefore, every prime number other than 2 is an odd number, and is called an odd prime.Is 213 a prime number?
For 213 to be a prime number, it would have been required that 213 has only two divisors, i.e., itself and 1. However, 213 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 213 = 3 x 71, where 3 and 71 are both prime numbers.Is 71 a prime number?
When a number has more than two factors it is called a composite number. Here are the first few prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, etc.Is 513 a prime number?
For 513, the answer is: No, 513 is not a prime number. The list of all positive divisors (i.e., the list of all integers that divide 513) is as follows: 1, 3, 9, 19, 27, 57, 171, 513. For 513 to be a prime number, it would have been required that 513 has only two divisors, i.e., itself and 1.Is 121 a prime number?
For 121 to be a prime number, it would have been required that 121 has only two divisors, i.e., itself and 1. However, 121 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 121 = 11 x 11, where 11 is a prime number.Which is prime number?
A prime number is a whole number greater than 1 whose only factors are 1 and itself. A factor is a whole number that can be divided evenly into another number. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29. Numbers that have more than two factors are called composite numbers.What is the least common multiple of 4 and 12?
Least common multiple (LCM) of 4 and 12 is 12.Why is 28 a perfect number?
The number 28 is a perfect number, because its proper divisors sum up to give 28, and that is the definition of a perfect number.What is the LCM of 6 and 12?
The lcm of 6 and 12 is 12.What is a composite number in math?
A composite number is a positive integer which is not prime (i.e., which has factors other than 1 and itself). The first few composite numbers (sometimes called "composites" for short) are 4, 6, 8, 9, 10, 12, 14, 15, 16, Note that the number 1 is a special case which is considered to be neither composite nor prime. 
