Change Page title when Pagingation the posts

The way I understand this, you’re trying to filter wp_title to include your pagination data.

You can change the format in the sprintf first parameter and other params as per your needs. Please use with caution.

add_filter('wp_title', function( $title ) { 

    global $paged // page number
         , $wp_query; // WordPress query data

    if( ! is_feed() && (int) $wp_query->max_num_pages > 1 ) {

        $title = sprintf(
            "%s - %d/%d - %s", // format
            get_bloginfo('name'), // blog name
            (int) $paged > 0 ? $paged : 1, // current page (goes 0 if no param set)
            $wp_query->max_num_pages, // max number of pages found
            get_bloginfo('description') // blog description
        );

    }

    return $title;

}, 999);

Hope that helps.