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-1^k*4^%k25^k k from 0 to infinity
sum-1^k*4^%k25^k k from 0 to infinity
Natural Language
Math Input
