func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1000000, M = 1000000007, D3 = (M + 1) / 3;   int T, n, m;   int pd[N + 5], pr[N], pn, phi[N + 5];   int f[N + 5], s0[N + 5], s1[N + 5], s2[N + 5];   void init() {     phi[1] = 1;     for (int i = 2; i <= N; i++) {       if (!pd[i]) phi[i] = i - 1, pr[++pn] = i;       for (int j = 1; j <= pn && i * pr[j] <= N; j++) {         pd[i * pr[j]] = pr[j];         if (i % pr[j] == 0) {           phi[i * pr[j]] = phi[i] * pr[j];           break;         } else           phi[i * pr[j]] = phi[i] * phi[pr[j]];       }     }     for (int d = 1; d <= N; d++)       for (int k = d; k <= N; k += d) f[k] += d * phi[k / d];     for (int L = 1; L <= N; L++) {       f[L] =           (((long long)L * L - L - L) % M * L % M -            (long long)(L + 1) * L % M * L % M +            (long long)L * (L + 1) % M * (L + L + 1) % M * D3 % M + 2LL * f[L]) %           M;       if (f[L] < 0) f[L] += M;     }     for (int i = 1; i <= N; i++) {       s0[i] = (s0[i - 1] + (long long)f[i]) % M;       s1[i] = (s1[i - 1] + (long long)i * f[i]) % M;       s2[i] = (s2[i - 1] + (long long)i * i % M * f[i]) % M;     }   }   int main() {     init();     for (scanf( %d , &T); T--;) {       scanf( %d%d , &n, &m);       if (n > m) swap(n, m);       long long ans = (long long)(n + 1) * (m + 1) % M * s0[n] % M;       ans -= (long long)(n + m + 2) * s1[n] % M;       ans += s2[n];       ans = (ans % M + M) % M;       printf( %d n , ans);     }     return 0;   }   