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#include <stdio.h>
#include <stdlib.h>
#define NR 1000000
int ciur[NR+1];
int a[NR+1][10];
int main()
{
int i,j,n,k,t;
freopen("divprim.in","r",stdin);
freopen("divprim.out","w",stdout);
for(i=2; i*i<=NR; i++)
if(ciur[i]==0)
for(j=i; j<=NR; j+=i)
ciur[j]++;
for(i=2; i<=NR; i++)
{
for(j=1; j<8; j++)
a[i][j]=a[i-1][j];
a[i][ciur[i]]=i;
}
scanf("%d",&t);
for(i=1; i<=t; i++)
{
scanf("%d%d",&n,&k);
printf("%d\n",a[n][k]);
}
return 0;
}