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the sum of the first 15 prime numbers is 328 .

Q: What is the sum of the first 15 prime numbers?

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2 + 13

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

If you multiply two prime numbers, the product (result) will be a composite number, not a prime number. A prime number has exactly two factors, 1 and itself. The product of two prime numbers will have those two numbers as factors, as well. The sum of two prime numbers might be prime if one of those two numbers is 2, the only even prime number, but otherwise it will not be a prime because two odd numbers will have an even sum, which means it is divisible by 2. Examples: 2 + 3 = 5 (prime) 3 + 7 = 10 (not prime) 13 + 17 = 30 (not prime) If you multiply two prime numbers, the sum of the digits of the product might or might not be prime. Examples: 2 x 7 = 14, sum of digits is 5 (prime) 2 x 11 = 22, sum of digits is 4 (not prime) 3 x 5 = 15, sum of digits is 6 (not prime) 3 x 7 = 21, sum of digits is 3 (prime) 5 x 7 = 35, sum of digits is 8 (prime)

2+3+5+7+11+13=41

Not including 1 as a prime number. Prime Numbers are ones that can only divide by themselves and 1 with no remainder. therefore the first 15 are: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47. 2+3+5+7+11+13+17+19+23+29+31+37+41+43+47 = 359

Related questions

The given numbers of 15 and 35 are not prime numbers but they add up to 50

They are: 2+13 = 15

There is only one square number from 5-15: 9. This can be written as the sum of 2 and 7, which are prime numbers.

It is 377.

The sum first Prime number is (2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 ) = 129 The sum of the first composite numbers is (4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18) = 112 The difference is 129 - 112 = 17 !!!!!

The sum of the first 15 odd numbers is 225.

The sum of the first 5 numbers is 15. 1+2+3+4+5=15

11+3+1=15 but 1 is not a prime number. 3 + 5 + 7 = 15

The sum of the first five whole numbers is 10.

15

2 + 13

yes it does