Redirect based on one parameter and strip it

[thecoalman]

I always go blind trying to look at these redirects so I'm asking for a little help. :)

https://example.com/folder/phpfile.php?prarmeter1=123&parameter2=123&parameter3=abc

I need to remove parameter1 and redirect
Paramter1 is always a number.
The other parameters may have other characters than numbers.
It has to be applied to only phpfile.php,