Just read up on them. Not sure how they'd be considered primitive.
Thought you might have been referring to the Piraha at first. They have no concept of numbers, unable to count higher than two (there's one, two, and many), no words for colors, no written language, no collective memory going back more than two generations, tell no fictional stories, have no art, no creation myths. A lot of other weird stuff too. Fascinating people. A number of articles about their lack of numbers, but this covers their culture pretty succinctly:
http://www.jcrows.com/withoutnumbers.html