public class At
{
public static void main(String[] args)
{
int haha;
for(int i=2;i<=3000;i++)
{
haha=0;
for(int j=2;j<Math.sqrt(i);j++)//关键
{
if(i%j==0)
{
haha=1;
break;
}
}
if(haha==0)
System.out.print(i+" ");
}
}
}