==Special values==Some special values include::formula_7:formula_8:formula_9where "G" represents Catalan's constant, and:formula_10:formula_11:formula_12:formula_13where formula_14 in the above is an example of the polygamma function.
:formula_6:formula_7:formula_8:formula_9:formula_10:formula_11:formula_12:formula_13где "G" — постоянная Каталана, а formula_14 — частное значение пентагамма-функции (полигамма-функции третьего порядка).