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Cod sursa(job #623251)
#include <stdio.h>
const int N=100001;
int n,i,j,e[N],x;
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
scanf("%d",&n);
for (i=1;i<=N;i++)
e[i]=i;
for (i=2;i<N;i++)
if (e[i]==i)
for (j=i;j<N;j+=i)
e[j]=e[j]/i*(i-1);
for(i=1;i<=n;i++)
{
scanf("%d",&x);
printf("%d\n",(e[x]*2)*x);
}
return 0;
}