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Q: What are two composite numbers whose prime factors have a sum of 18?

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323, 578 and 5929

65 and 77

If an odd number has more than two factors then it is a composite number but if it has only two factors then it is a prime number. Although all prime numbers are odd except for 2 many more odd numbers are composite numbers having more than two factors as for example 21 is an odd number whose factors are 1, 3, 7 and 21.

21 and 30 if you're only counting distinct factors. Add 25 and 32 if you're not.

29 = 512 36 = 729 26*32 = 576

Related questions

X is a variable which can represent any number, both prime and composite. Prime numbers are those whose only factors are themselves and 1. Composite numbers have other factors besides these.

4nd 9.

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

323, 578 and 5929

65 and 77

Yes

If an odd number has more than two factors then it is a composite number but if it has only two factors then it is a prime number. Although all prime numbers are odd except for 2 many more odd numbers are composite numbers having more than two factors as for example 21 is an odd number whose factors are 1, 3, 7 and 21.

21 and 30 if you're only counting distinct factors. Add 25 and 32 if you're not.

A composite number is a number that has factors other than 1 and itself. Assuming that you are not including the numbers 25 and 35. Prime numbers are numbers whose only factors are itself and one, so if you find the prime factors of each number: 26 factors to 2, 13 27 factors to 3,3,3 28 factors to 2,2,7 29 prime 30 factors to 2, 3, 5 31 prime 32 factors to 2,2,2,2,2 33 factors to 3, 11 34 factors to 2, 17.

prime numbers

29 = 512 36 = 729 26*32 = 576

111 is not a prime number. It is a composite number. A prime number is any number whose only factors are 1 and itself. 111's factors are 1, 3, 37, and 111. Well, it is prime if 111 is base 2 (binary) :P