import java.math.BigInteger;

import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
        int[] a=new int[] {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503};
        int m = a.length;
        Scanner cin = new Scanner(System.in);
        
        int t;t=cin.nextInt();
        while(t>0) {
            --t;
            int n,k;
            n=cin.nextInt();
            k=cin.nextInt();
            
            BigInteger ans=BigInteger.valueOf(k);
            for(int i=0;i<m;i++)
                if(n/k>=a[i]) {
                    ans=ans.multiply(BigInteger.valueOf(a[i]));
                    
                }
            System.out.println(ans);
        }
    }
}