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%20of%20(sum%20of%20k%20from%201%20to%20i)%20from%201%20to%20c
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
