The whole number between 13 and 17 is 15
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The number halfway between 13 and 21 can be found by taking the average of the two numbers. Add 13 and 21 together to get 34, then divide by 2 to get 17. Therefore, the number halfway between 13 and 21 is 17.
They are: 11 13 17 19 23 and 29 which makes six of them
13
> 1, 3, 5, 7, 11, 13, and 17 1 is not a prime number, but 2 and 19 are. The correct answer is 2, 3, 5, 7, 11, 13, 17, and 19.
For a number to have [only] 2 factors, it must be a prime number; the prime numbers between 0 and 20 are; 2, 3, 5, 7, 11, 13, 17, 19