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Cod sursa(job #819226)
#include<fstream>
using namespace std;
int v[1000002];
int main()
{
long long n,nr=1,i,j,aux,cat;
ifstream f("fractii.in");
ofstream g("fractii.out");
v[1]=1;
f>>n;
for(i=2;i<=n;i++)
v[i]=1;
for(i=2;i<=n;i++)
{
if(v[i]==1)
{
v[i]=i-1;
cat=1;
for(j=i+i;j<=n;j+=i)
{
cat++;
aux=cat;
v[j]*=(i-1);
while(aux%i==0)
{
v[j]*=i;
aux=aux/i;
}
}
}
nr+=v[i];
}
g<<(2*nr-1);
}