Simple Mod Rewrite - 301

Hey there, thanks for the help.

I am trying to do a simple 301 from

http://www.example.com/?cat=1
to
http://www.example.com/1

so far I have

RewriteEngine On
RewriteBase /
RewriteRule ^\?cat=([0-9]+)$ /$1 [R] 

Code (markup):

But can't get it to work. Any help is greatly appreciated (I'm learning).

Thanks!