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.
UPGRADE TO PRO
APPS
TOUR
1/pi =((2*sqrt(2))/9801) sum_(k=0)^infinity (((4k)!*(1103+(26390*k)))/(((k!)^4)*(396)^(4*k)))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random