func_code_string: #include <bits/stdc++.h>   using namespace std;   bool prime(int x) {     for (int i = 2; i * i <= x; i++) {       if (x % i == 0) return 0;     }     return 1;   }   int main() {     int n;     vector<int> ans;     cin >> n;     for (int i = 2; i <= n; ++i) {       if (prime(i)) {         for (int j = i; j <= n; j *= i) {           ans.push_back(j);         }       }     }     cout << ans.size() << endl;     for (auto i : ans) {       cout << i <<    ;     }     return 0;   }   