  Motivated by the work on hypergeometric summation theorems (recorded in the
table III of Prudnikov et al. pp. 541-546), we have established some new
summation theorems for Clausen's hypergeometric functions with unit argument in
terms of $\pi$ and natural logarithms of some rational and irrational numbers.
Also, we have given some modified summation theorems for Clausen's
hypergeometric functions.
