include<stdio.h> include<cmath> int fx(int n){if(n<2)return 0;if(n==2)return 1;int m=int(sqrt(n));for(int i=2;i<=m;++i){ if(n%i==0)return 0;} return 1;} include<stdlib.h> int main(){ int k,a;printf("请输入一个整数");scanf("%d",&k);if(k<2&&k...