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#include <stdio.h>
#include <stdlib.h>
char ciur[1000001];
int maxnr[8][1000001];
int main()
{
int i,j,n,k,t;
freopen("divprim.in","r",stdin);
freopen("divprim.out","w",stdout);
for(i=2; i<=1000000; i++)
if(ciur[i]==0)
{
ciur[i]=1;
for(j=2*i; j<=1000000; j+=i)
ciur[j]++;
}
maxnr[0][1]=1;
for(i=2; i<=1000000; i++)
{
for(j=0; j<=7; j++)
maxnr[j][i]=maxnr[j][i-1];
maxnr[ciur[i]][i]=i;
}
scanf("%d",&t);
for(i=1; i<=t; i++)
{
scanf("%d%d",&n,&k);
printf("%d\n",maxnr[k][n]);
}
return 0;
}