func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int add(int a, int b) {     return (a + b >= 1000000007) ? a + b - 1000000007 : a + b;   }   inline void inc(int &a, int b) { a = add(a, b); }   inline int sub(int a, int b) {     return (a - b < 0) ? a - b + 1000000007 : a - b;   }   inline void dec(int &a, int b) { a = sub(a, b); }   inline int mul(int a, int b) { return 1ll * a * b % 1000000007; }   inline void grow(int &a, int b) { a = mul(a, b); }   const int INV = 205555557;   int phi[1000005];   int pre[1000005];   int f[1000005];   int onepre[1000005];   int twopre[1000005];   void phiCalc() {     phi[0] = 0;     phi[1] = 1;     for (int i = 2; i <= 1000005 - 1; i++) phi[i] = i;     for (int i = 2; i <= 1000005 - 1; i++) {       if (phi[i] == i) {         for (int j = i; j <= 1000005 - 1; j += i) phi[j] -= phi[j] / i;       }     }   }   int func(int n, int m) {     int res = sub(0, INV);     grow(res, n);     grow(res, n + 1);     grow(res, n + 2);     int tres = 15;     inc(tres, mul(4, mul(n, mul(n, n))));     dec(tres, mul(12, mul(n, n)));     dec(tres, mul(7, n));     int ttres = mul(n, n);     dec(ttres, mul(3, n));     dec(ttres, 3);     grow(ttres, sub(0, 6));     grow(ttres, m);     return mul(res, add(tres, ttres));   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     phiCalc();     for (int i = 1; i < 1000005; i++) {       for (int j = i; j < 1000005; j += i) inc(f[j], mul(i, phi[j / i]));     }     pre[0] = f[0];     onepre[0] = twopre[0] = 0;     for (int i = 1; i < 1000005; i++) {       pre[i] = add(pre[i - 1], f[i]);       onepre[i] = add(onepre[i - 1], mul(i, f[i]));       twopre[i] = add(twopre[i - 1], mul(mul(i, i), f[i]));     }     int t;     cin >> t;     while (t--) {       int n, m;       cin >> n >> m;       if (n > m) swap(n, m);       int ans = 0;       inc(ans, pre[n]);       inc(ans, twopre[n]);       dec(ans, mul(2, onepre[n]));       inc(ans, mul(m, mul(n, pre[n])));       dec(ans, mul(m, onepre[n]));       inc(ans, mul(m, pre[n]));       dec(ans, mul(n, onepre[n]));       inc(ans, mul(n, pre[n]));       grow(ans, 2);       inc(ans, func(n, m));       cout << ans << endl;     }   }   