co-written eight number one singles
... that Bonnie McKee has co-written eight number one singles, five of which were sung by Katy Perry?
... that <a href="./Bonnie_McKee" id="mwBYE" rel="mw:WikiLink" title="Bonnie McKee">Bonnie McKee</a> has <b id="mwBYI"><a href="./List_of_songs_written_by_Bonnie_McKee" id="mwBYM" rel="mw:WikiLink" title="List of songs written by Bonnie McKee">co-written eight number one singles</a></b>, five of which were sung by <a href="./Katy_Perry" id="mwBYQ" rel="mw:WikiLink" title="Katy Perry">Katy Perry</a>?