29 and 31
-17-19All of the numbers between 13 and 24:Note= The italic numbers are composite. The bold numbers are prime.14151617181920212223
24
All numbers greater than 2 are composites, not prime numbers.
Six of them.
There are 5: 11,13,17,19,23
-17-19All of the numbers between 13 and 24:Note= The italic numbers are composite. The bold numbers are prime.14151617181920212223
24
24
24
There are none.
All numbers greater than 2 are composites, not prime numbers.
There are 25 prime numbers between 1 and 100.
There aren't any.
There are none
Six of them.
22 and 24 theoretically.
The sum of the 25 primes less than 100 is even (it is 1060).The first prime number is 2. Every other prime number is odd.So, of the 25 primes less than 100, one is even and 24 are odd.Any two odd numbers sum to an even number. Therefore, an even number of odd numbers has an even sum. So the sum of 24 odd numbers is even.Therefore, the sum of the 25 primes less than 100 is even.