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The factors of 21 are 1, 3, 7, and 21 which means that 21 is composite.

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Q: List all the factors of 21 is the number 21 prime or composite?
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How did Euclid prove there is no largest prime?

The proof that there is no largest prime:Assume that there are a finite number of primes for the sake of contradiction. Then, there should be a number P that equals p1p2p3...pn+1. P is either prime or not prime (composite). If it is prime, we just show that P is larger than the largest prime in the list. If it's not prime, it must be composite. Composite always has at least one factor that is prime, but since P is not divisible by any prime in the list, the unknown prime factor(s) must be something not in the list, this also shows that there is a prime larger than the largest prime in the list. Both cases show that no matter how large a list of prime numbers, there will be always at least one larger prime outside of that list.


What are the answers for math makes sense grade 6 page 46 and47?

List all the factors of each number. Which factors are prime factors between 20 and 28.


Is 41 43 61 63 a composite?

63 is the only composite number in that list.


Do perfect squares have an even or odd set of prime factors?

FactorsPerfect squares have an odd number of factors. If you think of factor pairs, the pair of factor that when multiplied together equals the given number, you realize that there are two factors for each pair until you come to the factor that when squared equals the number. For example, the factor pairs of 16 are 1 x 16, 2 x 8, and 4 x 4, giving us the factors of 1, 2, 4, 8, and 16 - an odd number of factors.Prime FactorsHowever, the situation is different with prime factors. It will depend on whether you list every prime factor or only the distinct prime factors. There will always be an even number of prime factors because when you square a number, you double the prime factors, which means you have an even number. That is not the case for distinct prime factors, because when you square a number, you are not adding any additional distinct factors. So, in some cases, there will be an even number of distinct prime factors and sometimes an odd number. Some examples follow.4 = 2 x 2. There are two prime factors, but one distinct prime factor.36 = 2 x 2 x 3 x 3. There are four prime factors and two distinct prime factors.900 = 2 x 2 x 3 x 3 x 5 x 5. There are six prime factors and three distinct prime factors.


List the numbers that this composite number can be divided by 9?

9,18,27,36,45,54,63,72,81,90,99,108,117,126,135,144,153,162,171,180,189,198,207,216,225,234,243,252,261,270,279,288,297,306..........

Related questions

What are the prime and composite number of the factors 92?

To find the prime and composite factors of a number, you can list the factor pairs. 92: 1 x 92 2 x 46 4 x 23 The prime factors are 2, 23. The composite factors are 4, 46, 92.


Who discover the prime and composite numbers?

You do! You first list all the factors of a number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.


Can you list two composite numbers whose product is prime?

No, because a prime number that has only two factors, 1(which is niether prime nor composite) and itself(prime).


How do you learn to do prime and composite numbers?

List their factors. Prime numbers have two factors, composite numbers have more than two.


What are the prime and composite numbers of 33 18?

To find the prime and composite factors of a number, list all the factor pairs of the number. Then, go through them and list the primes and composites. 33 1 x 33 3 x 11 The prime factors are 3 and 11. The composite factor is 33. 1 is neither prime nor composite. 18 1 x 18 2 x 9 3 x 6 The prime factors are 2 and 3. The composite factors are 6, 9, and 18.


Who discover prime and composite numbers?

You do! You list the factors to see if it is prime or not. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.


Is 73 prime or composite and what are the factors?

73 is Prime, therefore there are no factors to list except for 1.


What is a list of the factors of 27?

The factors of 27 are 1,3,9,27 It's NOT prime it IS composite


How do you solve composite factor?

List the factors. Erase 1 and the prime factors.


What are the numbers that are composite?

The numbers with three or more factors; it's an infinite list.


Can a prime number be a factor of a composite number?

yes because 2,3,5,7,11,13,17,19,23,29 are the first 10 prime numbers so if i say list factors of 12 2 is one


Is 74 a prime number or a composite number?

Composite Work: A prime number is only divisible by itself and one. 74 is divisible by 2 and 37 Not prime. As soon as you see that '4' at the end, you know it's an even number. No even number (except '2') can be a prime, because in addition to itself and '1', it also has '2' for a factor.