#include<iostream>
using namespace std;
int main()
{
int x,y;
while(cin>>x>>y)
{
if(x==0&&y==0)
{
break;
}
int n;
{
for(n=x;n<=y;n++)
{
for(int i=2;i<n*n+n+41;i++)
{
if((n*n+n+41)%i!=0)
{
cout<<"YES"<<endl;
break;
}
else
{
cout<<"NO"<<endl;
}

}
}
}
}
return 0;
}