the sum of the first 15 prime numbers is 328 .
15
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.
15 is the product of two prime numbers; 3 x 5
Yes: 1 + 3 + 19 5 + 7 + 11 1 + 7 + 15
The smallest is 15.
4, 5 and 6
No. 15 is the product of two prime numbers: 3 and 5
2 + 13