mod_rewrite redirect everything but a certain file

[vh1]

hey, how would I get mod rewrite to:
redirect entry/([0-9]+) to index.php?id=$1
and everything else to redirect to index.what.html

I've tried this (and variations), but nothing works
RewriteCond %{REQUEST_URI} entry/([0-9]+)
RewriteRule entry/([0-9]+) index.php?id=$1 [L]
RewriteCond %{REQUEST_URI} !entry$
RewriteRule ^(.) index.what.html [L]