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Cod sursa(job #749059)
#include <stdio.h>
int v[100001];
long long y,i,t,j,n,x;
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
scanf("%d",&n);
for(i=1; i<100001; ++i)
v[i]=i-1;
for(i=2; i<100001; ++i)
for(j=2*i; j<100001; j+=i)
v[j]-=v[i];
for(i=n; i>0; --i)
{
scanf("%d",&x);
y=v[x]*2*x;
printf("%lld\n",y);
}
return 0;
}