How many movies have Arve Opsahl and Knut Gløersen collaborated on?

They have worked on 3 movies together! Their first movie together was Knutsen & Ludvigsen (1974) while their highest rated movie together was The Last Exploits of the Olsen Gang (1975). They have not worked together since The Olsen Gang and Dynamite-Harry On The Trail (1977). They are most known for their comedy films together.