#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cstring>
#include<cmath> 
#include<algorithm>
using namespace std;
bool prime(int n){
	for(int i = 2;i< n;++i){
		if(n % i == 0){
			return 0;
		}
	}
	return 1;
}
int main(){
	int n;
	cin>>n;
	while(n--){
		int x,y;
		cin>>x>>y;
		for(int i = x;i <= y;++i){
			if(prime(i)){
				cout<<i<<"\n";
			}
		}
	}
	return 0;
}