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Cod sursa(job #661435)
//Divizori Primi
#include<fstream>
using namespace std;
int t,n,j,i,k,a[1000005],v[1000005][11];
int main()
{
ifstream f("divprim.in");
ofstream g("divprim.out");
f>>t;
v[1][0]=0;
for (i=2;i<1000005;i++)
{
if(a[i]==0)
for (j=i;j<1000005;j++)
a[j]++;
for(j=0;j<=7;j++)
v[i][j]=v[i-1][j];
if(a[i]<=7)
v[i][a[i]]=i;
}
for(i=1;i<=t;t++)
{
f>>n>>k;
g<<v[n][k]<<'\n';
}
f.close();
g.close();
return 0;
}