           </td>
<td>
              <p>
                ζ(2)
              </p>
            </td>
<td>
              <p>
                1.64493
              </p>
            </td>
<td>
              <p>
                <a href="http://en.wikipedia.org/wiki/Riemann_zeta_function" target="_top">Riemann
                zeta function</a>
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                zeta_three
              </p>
            </td>
<td>
              <p>
               