This app allows you to enter a series and test for convergence or divergence using the nth term test, the ratio test and/or the comparison test. Several things to note:[br]1) You may want to move the green box (where you enter the series) to see it more clearly.[br]2) It appears that for this app, that the series always starts at n=1.[br]3) YOU must choose the comparison series.[br]4) The slider allows you to change the number of terms displayed.[br][br]Good luck.