Mister Exam

Other calculators

1/(n((ln*n)^2))

  • How to use it?

  • Sum of series:
  • (2n+1)/(n^2(n+1)^2) (2n+1)/(n^2(n+1)^2)
  • (5^n+4^n)/6^n (5^n+4^n)/6^n
  • 1/(n((ln*n)^2)) 1/(n((ln*n)^2))
  • (4x)^(2n)

  • Identical expressions

  • one /(n((ln*n)^ two))
  • 1 divide by (n((ln multiply by n) squared ))
  • one divide by (n((ln multiply by n) to the power of two))
  • 1/(n((ln*n)2))
  • 1/nln*n2
  • 1/(n((ln*n)²))
  • 1/(n((ln*n) to the power of 2))
  • 1/(n((lnn)^2))
  • 1/(n((lnn)2))
  • 1/nlnn2
  • 1/nlnn^2
  • 1 divide by (n((ln*n)^2))
Sum of series/ 1/(n((ln*n)^2))

Sum of series 1/(n((ln*n)^2))


∑
=

The solution

You have entered [src] 
  oo           
____           
\   `          
 \        1    
  \   ---------
  /        2   
 /    n*log (n)
/___,          
n = 1
$$\sum_{n=1}^{\infty} \frac{1}{n \log{\left(n \right)}^{2}}$$ 
Sum(1/(n*log(n)^2), (n, 1, oo))
The radius of convergence of the power series
Given number:
$$\frac{1}{n \log{\left(n \right)}^{2}}$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = \frac{1}{n \log{\left(n \right)}^{2}}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty}\left(\frac{\left(n + 1\right) \log{\left(n + 1 \right)}^{2} \left|{\frac{1}{\log{\left(n \right)}^{2}}}\right|}{n}\right)$$
Let's take the limit
we find
True

False
The rate of convergence of the power series
Numerical answer [src] 
Sum(1/(n*log(n)^2), (n, 1, oo))
Sum(1/(n*log(n)^2), (n, 1, oo))
The graph
Sum of series 1/(n((ln*n)^2))

    Examples of finding the sum of a series

    © Mister Exam – Calculator