#include<fstream.h>
ofstream g("matrice.out");
void main()
int n,prim,d,nr;
do{  cout<<"dati n:");cin>>n;}while(!(n>0&&n<10));
g<<n<<endl;
nr=1;
for(i=1;i<=n;i++)
{
g<<endl;
for(j=1;j<=n;j++)
 {do{	nr++;
	 prim=1;
	d=2;
	while(d<nr/2) if(nr%d==0)
			prim=0;
		      else
		      d++;

     }  while(prim!=1);//am generat un nr prim
  g<<nr;
 }  //sf j
}//sf i
g("close")
}