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Cod sursa(job #486488)
#include<stdio.h>
const int N = 1<<20;
int e[N];
int main()
{
int n,i,j,k,x;
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
scanf("%d",&n);
for(i=1;i<=100000;++i)
e[i]=i;
for(i=2;i<=100000;++i)
if(e[i]==i)
for(j=i;j<=100000;j+=i)
e[j]=e[j]/i*(i-1);
for (k=1;k<=n;++k)
{
scanf("%d",&x);
printf("%lld\n",2*e[x]*x);
}
return 0;
}