Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
Sum[Sum[(n!/e)^(-m-1) (1/pi atan(tan(pi/e n!)))^m, {m, 0, 100}],{n,2,100}]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random