Which of the following describes the set of all possible values of the positive integer k such that, for each positive odd integer n, the value of ~$n \over k$~ is midway between consecutive integers?
All positive integers greater than 2
All prime numbers
All positive even integers
All even prime numbers
All positive even multiples of 5
n/K=a+0.5
n=aK+0.5K
n是整数推出K=2,4,6...K是偶数,所以aK是偶数
n是奇数,aK是偶数,所以0.5K是奇数,推出K=2
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