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The prime numbers 3 an 7 are both odd and sum to 10.

Q: What 2 odd primes equal the sum of 10?

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They add up to 17

The sum of the five odd numbers between 10 and 20 is: sum = 5 x (11 + 19) / 2 = 75.

For a 2-digit prime number (which are all odd) to be the sum of two prime numbers, one of the prime numbers will have to be 2. That means the difference between the sum and the other addend will have to be 2. Prime numbers that differ by 2 are called twin primes. There are six pairs of 2-digit twin primes. Your numbers are 13, 19, 31, 43, 61 and 73.

Sure. All composite numbers can be written as a product of primes. It shouldn't be tough to find a composite number that's the sum of three other composite numbers. Let's try 30. 2 x 3 x 5 = 30 Product of primes, check. 6 (2 x 3) + 10 (2 x 5) + 14 (2 x 7) = 30 Sum of three products of primes, check.

There are two sets of 3 consecutive numbers whose sum is 30 but neither set contains all odd numbers. The two sets are: 8, 10 and 12 as well as 9, 10 and 11.

Related questions

10

All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.

It is not possible.

They add up to 17

The sum of the first 10 odd whole numbers is 100.

It is: 2+3+5+7 = 17

The sum of the five odd numbers between 10 and 20 is: sum = 5 x (11 + 19) / 2 = 75.

100

Are you asking The first prime that is the sum of three primes? I'll help. 2,3,5 are the first 3. the sum is 10. Not prime. now try 3,5,7. 15. Not prime. 5,7,11. 5,7,11 work, the sum is 23, which is a prime, not divisible by 2,3,4,5,6,7,8,9, so on. So the Three Primes are 5 7 11. The sum is 23.

For a 2-digit prime number (which are all odd) to be the sum of two prime numbers, one of the prime numbers will have to be 2. That means the difference between the sum and the other addend will have to be 2. Prime numbers that differ by 2 are called twin primes. There are six pairs of 2-digit twin primes. Your numbers are 13, 19, 31, 43, 61 and 73.

24

Yes - every prime number except for 2 is odd - including the primes between 10 and 20, namely 11, 13, 17, and 19.