A way to hide a page in admin panel ONLY.txt

add_action( 'pre_get_posts' ,'exclude_this_page' );
function exclude_this_page( $query ) {
	if( !is_admin() )
		return $query;

	global $pagenow;

	// WordPress 2.9
	if( 'edit-pages.php' == $pagenow )
		$query->set( 'post__not_in', array(23) );

	// WordPress 3.0
	/*
	if( 'edit.php' == $pagenow && ( get_query_var('post_type') && 'page' == get_query_var('post_type') ) )
		$query->set( 'post__not_in', array(23) );
	*/
	return $query;
}