#include <iostream.h>
#include <fstream.h>

main() 
{
   char name[80];
   int stop, start;
   cout<<"Enter output file name : ";
   cin>>name;
   ofstream out(name);
   cout<<"1 2 3 5 7 11 13 17 19 23"<<endl<<endl;
   cout<<"Start : "; cin>>start;
   cout<<"Stop  : "; cin>>stop;
   for (int i=start; i<=stop; i++) {
      bool prime=true;
      for (int x=2; x<=i/2; x++)
         if (i%x == 0) {prime=false; break;}
      if (prime) out<<i<<endl;
      }
   out.close();
}