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Other Series

 Other Series
 
Define
 
,
 
where i, k and n are positive integers.
 
Setting
 
,
 
Then, as n approaches infinity, we have
 
 
 
 
or
 
.
 
The above series is expressed in the summation notation as
 
.
 
Multiplying both sides of above sum by gives
 
.
 
Therefore, we obtain
 
.
 
 
We thus obtain a remarkable formula that shows the connection to Euler Constant, sums of power, and Zeta function.
 
,
 
where .
 
 
Notice that 
 
, where A is Glaisher’s constant = 1.28243…