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Cod sursa(job #125868)
#include <stdio.h>
#define nmax 100001
int main()
{
freopen("sum.in", "r", stdin);
freopen("sum.out", "w", stdout);
int T, n, s[nmax], p[nmax];
for (int i = 1; i < nmax; ++i)
s[i] = i, p[i] = i - 1;
for (int i = 2; i < nmax; ++i)
for (int j = 2 * i; j < nmax; j += i)
s[j] += s[i], p[j] -= p[i];
for (int i = 1; i < 10; ++i)
printf("%d %d\n", s[i], p[i]);
scanf("%d", &T);
for (int t = 1; t <= T; ++t) {
scanf("%d", &n);
printf("%lld\n", (long long)2 * n * p[n]);
}
return 0;
}