/**
 * Ulam sequence.
 * 
 * @author (Stefan Edelkamp) 
 * @version (2013)
 */
public class Ulam
{
    /**
     * The Ulam sequence
     * 
     * @param  n   the number to start with 
     * @return     value 1 if reached
     */
    public int u(int n) { 
      System.out.print("u("+n+"),"); 
      return n == 1 ? 1 : n%2 == 0 ? u(n/2) : u(3*n+1); 
    }
}