Use Consequetive Post Number as Permalink

I am trying to get my permalink structure to be the post number. For example:

http://sitename.com/03 —This will be the third post which is published

http://sitename.com/04 —This will be the fourth post which is published

and so on…

I am currently using the following to get the postcount:

$loopday = ''; if ( have_posts() ) : $countposts = 0; while(have_posts()) : the_post(); $countposts++;

Output in loop:

printf("%03d", get_post_meta($post->ID,'incr_number',

I just want that number in the permalinks, I have a feeling it isn’t possible, but I thought I would give it a shot.

Thanks