#include<math.h>
main()
{     int a,b,m,k,i,n=0;

printf(“input a and b:＼n”);
scanf("%d%d",&a,&b);

for(m=a;m<=b;m++)
{     if(！(n%5))    printf("＼n");
k=sqrt(m);
for(i=2;i<=k;i++)

if(!(m%i))      break;
if(i>=k+1)

{printf("%-5d",m);        n++;}

               }

}