fprintf(f_ptr,"%d",2);
fprintf(f_ptr,"%d",3);
fprintf(f_ptr,"%d",5);
fprintf(f_ptr,"%d",7);
fprintf(f_ptr,"%d",11);
fprintf(f_ptr,?/FONT>%d?/FONT>,13);
fprintf(f_ptr,"%d",17);
fprintf(f_ptr,"%d",19);
fprintf(f_ptr,"%d",23);
fprintf(f_ptr,"%d",29);