func_code_string: #include <bits/stdc++.h>   using namespace std;   const int INF = 2 * 1e9;   const double PI = acos(-1);   vector<int> a;   int p[10000001];   int m = 10000000;   int main() {     int n;     cin >> n;     for (int i = 2; i * i <= m; i++) {       if (!p[i]) {         for (int j = i * i; j <= m; j += i) p[j] = 1;       }     }     for (int i = 2; i <= m; i++)       if (!p[i]) a.push_back(i);     for (int i = 0; i < n; i++) cout << a[i] <<    ;   }   