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Cod sursa(job #661635)
// http://infoarena.ro/problema/sum
#include <fstream>
#include <math.h>
#define X 100001
using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
int v[X];
void phi()
{
for (int i=1;i<=X;i++)
v[i]=i;
for (int i=2;i<=X;i++)
if (v[i]==i)
for (int j=i;j<=X;j+=i) v[j] -= v[j] / i;
}
int main()
{
int n,t;
f>>t;
phi();
for(int i=1;i<=t;i++)
{
f>>n;
g<<n*v[n]*2<<"\n";
}
}