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Cod sursa(job #551414)
#include<stdio.h>
#define Nmax 100009
int x,i,j,n,a[Nmax];
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
scanf("%d",&n);
for (i=1;i<=Nmax;i++)
a[i]=i;
for (i=2;i<=Nmax;i++)
if (a[i]==i)
for (j=i;j<Nmax;j+=i)
a[j]=a[j]*(i-1)/i;
for (i=1;i<=n;i++)
{
scanf("%d",&x);
printf("%lld\n",(long long)2*x*a[x]);
}
return 0;
}