Problem 58284. Easy Sequences 117: Fractional Part of Cube Roots
The fractional part function of a positive real number r, denoted as  , is defined as:
, is defined as:  , where
, where  , is the floor of r. Thus,
, is the floor of r. Thus,  ,
,  and
 and  .
.
Given a  positive integer n, create the function  , that evaluates the following summation:
, that evaluates the following summation:
For example for  :
:    
Please present the function output rounded-off to nearest 3 decimal places Therefore, for  , the function should return
, the function should return  .
.
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NOTE: This is a follow-up problem to: Problem 53930. Easy Sequences 65: Fractional Part of Square Roots.
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