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Cod sursa(job #346744)
#include <stdio.h>
#define max 100000
long phi[max+1],i,n;
long long j,x;
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
n=100000;
for (i=1; i<=n; ++i) phi[i]=i;
for (i=2; i<=n; ++i)
if (phi[i]==i)
for (j=i; j<=n; j+=i) phi[j]-=phi[j]/i;
scanf("%ld\n",&n);
phi[1]=0;
for (i=1; i<=n; ++i)
{ scanf("%lld\n",&x); j=x*phi[x] << 1; printf("%lld\n",j);}
fclose(stdin); fclose(stdout);
return 0;
}