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.
Eulerphi[n]=n/3, n\leq1000
Eulerphi[n]=n/3, n\leq1000
Natural Language
Math Input
Extended Keyboard