The integral Test :

If  is positive, continuous and decreasing for  and  then  and either both converge or both diverge.

The integral series is .

Let the function be .

Find the derivative of the function.

.

 is positive, continuous and decreasing for .

 satisfies the conditions of Integral Test.

Integral Test is applicable for the series.

Integral Test :

Consider .

Consider integral .

Substitute .

Apply derivative on each side with respect to .

.

Substitute .

.

.

Therefore, the series  is converges.

The series  is converges.