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Cod sursa(job #627943)
#include <cstdio>
#define file_in "sum.in"
#define file_out "sum.out"
#define nmax 100000
int T,i,j,v[nmax],N;
int main(){
freopen(file_in,"r",stdin);
freopen(file_out,"w",stdout);
scanf("%d", &T);
for (i=1;i<=nmax;++i)
v[i]=i-1;
for (i=2;i<=nmax;++i)
for (j=i+i;j<=nmax;j+=i)
v[j]-=v[i];
while(T--){
scanf("%d", &N);
printf("%lld\n", v[N]*N*2);
}
return 0;
}