uble factorial function.
        </li>
        <li>
          <b>I4_HUGE</b> returns a "huge" I4.
        </li>
        <li>
          <b>I4_IS_PRIME</b> reports whether an I4 is prime.
        </li>
        <li>
          <b>I4_IS_TRIANGULAR</b> determines whether an integer is triangular.
        </li>
        <li>
          <b>I4_PARTITION_DISTINCT_COUNT</b> returns any value of Q(N).
        </li>
        <li>
          <b>I4_POCHHAMMER</b> returns the value of ( I * (I+1) * ... * (J-1) * J ).
        <