# Homework Help: Basic series

1. Nov 6, 2008

### phyguy321

1. The problem statement, all variables and given/known data
what is $$\sum$$ i1/3 from i=1 to n

2. Relevant equations

3. The attempt at a solution
is there an expansion for this?

2. Nov 6, 2008

### gabbagabbahey

As long as $n$ is finite, the series will converge, but there is no closed form for this summation as terms get successively larger.

(unless the 'i' inside your sum is actually supposed to be $\sqrt{-1}$ rather than an iterator)