# File lib/three141.rb, line 16
  def digits(id)
    s1 = series(1, id).to_f;
    s2 = series(4, id).to_f;
    s3 = series(5, id).to_f;
    s4 = series(6, id).to_f;
    
    pid = (4.0 * s1 - 2.0 * s2 - s3 - s4).to_f;
    pid = pid - pid.to_i;
    if (pid < 0.0) 
      pid = pid + 1.0;
    end
    chx = ihex(pid, 16);
    return chx[0..10]
  end