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Cod sursa(job #958548)
#include <iostream>
#include <fstream>
#define N 100001
using namespace std;
int x,n,i,j,phi[N];
int main()
{ freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
scanf("%d",&n);
phi[1]=1;
for (i = 2; i <= 100000; i++)
phi[i] = i-1;
for (i = 2; i <= 100000; i++)
for (j = 2*i; j <= 100000; j+= i)
phi[j] -= phi[i];
for(i=1;i<=n;i++)
{ scanf("%d",&x);
printf("%lld\n",(long long)phi[x]*2*x);
} return 0;}