public class Prime
{
public static void main( String[] args )
{
for (int num = 2; num < 20; num++)
{
if ( ifPrime(num) == true)
{
System.out.println( num + " < ");
}
else
{
System.out.println( num );
}
}
}
public static boolean ifPrime(int n)
{
for (int i = 2;i < n;i++)
if (n%i==0)
{
return false;
}
return true;
}
}