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Cod sursa(job #773496)
#include<stdio.h>
#define M 1000001
FILE *fin=fopen("fractii.in.txt", "r");
FILE *fout=fopen("fractii.out.txt", "w");
long long n,i,j,nr;
float v[M];
int main()
{
fscanf(fin, "%d", &n);
for (i=1; i<=n; i++)
v[i]=i;
for (i=2; i<=n; i++)
if (v[i]==i)
for (j=i; j<=n; j+=i)
{
v[j]/=i;
v[j]*=(i-1);
}
for (i=1; i<=n; i++){
nr+=v[i];
fprintf(fout, "%lld \n", nr);}
fprintf(fout,"%lld", 2*nr-1);
fclose(fin);
fclose(fout);
return 0;
}