Show number of posts AND number on current page

This should work, but I haven’t tested it:

global $wp_query;
$page = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
$ppp = get_query_var('posts_per_page');
$end = $ppp * $page;
$start = $end - $ppp + 1;
$total = $wp_query->found_posts;
echo "Showing posts $start through $end of $total total.";