newbie prefix question

[Chris Seberino]

I'm trying to use a prefix in a command.
I want to type "ESC <some number>" before
invoking say C-a and have C-a know what
<some number> is..


If I type "ESC x print-prefix" then
it says the argument is 1 but I cannot
type C-a after "ESC 5" and get a 5.

Please help.

Here is my command I wrote to test:

;(global-set-key "\C-a" 'print-prefix)

(defun print-prefix(&optional arg)
   (interactive "P")
   (message "Argument is %d." (prefix-numeric-value arg))
   
)

Chris
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