b> computes the binomial coefficient C(N,K).
        </li>
        <li>
          <b>I4_FACTOR</b> factors an I4 into prime factors.
        </li>
        <li>
          <b>I4_FACTORIAL</b> computes the factorial of N.
        </li>
        <li>
          <b>I4_FACTORIAL_VALUES</b> returns values of the factorial function.
        </li>
        <li>
          <b>I4_FACTORIAL2</b> computes the double factorial function.
        </li>
        <li>
          <b>I4_FACTORIAL2_VALUES</b> returns values of the do