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Cod sursa(job #219298)
#include<stdio.h>
const int N=100000;
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
int i,n,e[100005],j,phi,s2,x;
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++)
printf("%d ", e[i]);*/
for(;n;--n)
{
scanf("%d", &x);
phi=e[x];
s2=2*(long long)(phi*x);
printf("%lld\n", (long long)s2);
}
return 0;
}