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Q: What two composite numbers have prime factors that add up to 18?

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Prime numbers have only two factors which are themselves and one and they add up in the same way as composite numbers which have more than two factors

The sum of two prime numbers will be composite unless one of the prime numbers is 2.

Not necessarily. For example 15 and 16 are composite numbers. They add to 31, which is a prime number. Similarly, the composite numbers 20 and 21 add up to 41, which is a prime number.

The only number between 30 and 40 with distinct prime factors which add up to 12 is 35.

composite

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

No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.

The first two prime numbers add up to another prime number.

You may mean: 3 and 5 are prime numbers that add up to the composite number of 8

Composite.

Composite.

23, 29 and 31 are prime. The rest are composite.

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