Upvote:3
Your residence permit is sufficient:
If your visa is from a Schengen area country, it automatically allows you to travel to the other Schengen countries as well. If you have a valid residence permit from one of those Schengen countries, it is equivalent to a visa.
This is confirmed by the Norwegian Directorate of Immigration:
Persons who do not need a visa to visit Norway (visa-free)
...
- Persons with a valid resident permit or permanent residence permit in Norway. You must bring your residence card and passport.