模擬題吧。

#include "stdio.h"
int prime[10005];
int number[10005];
int c_table(int p)
{
    int i,temp;
    int addr=0;
    for(i=2;i<=p;i++){number[i]=1;}
    for(i=2;i<=p/2;i++)
    {
        if(number[i]!=0)
        {
            for(temp=i+i;temp<=p;temp=temp+i){number[temp]=0;}
        }
    }
    for(i=2;i<=p;i++){if(number[i]!=0)prime[addr++]=i;}
    return addr;
}
int main()
{
    int n,e,count,sum;
    int left,right;
    e=c_table(10000);
    while(1)
    {
        scanf("%d",&n);
        if(n==0)break;
        left=right=0;
        count=0;sum=prime[0];
        do 
        {
            if(sum<n)
            {
                right++;
                sum+=prime[right];
            }
            else
            {
                if(sum>n)
                {
                    sum-=prime[left];
                    left++;
                }
                else
                {
                    count++;
                    right++;
                    sum+=prime[right];
                }
            }
        } while(right<e);
        printf("%d\n",count);
    }
    return 0;
}