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.
(Li(4x)-Li(2x))/(Li(2x)-Li(x)), x=10000
(Li(4x)-Li(2x))/(Li(2x)-Li(x)), x=10000
Natural Language
Math Input
Extended Keyboard