Editing Oz (programming language) (section)

===Example: Trial division sieve===
This example computes a stream of prime numbers using the [[trial division]] algorithm by recursively creating concurrent stream agents that filter out non-prime numbers:
<syntaxhighlight lang="erlang">
fun {Sieve Xs}
   case Xs of nil then nil
   [] X|Xr then Ys in
      thread Ys = {Filter Xr fun {$ Y} Y mod X \= 0 end} end
      X|{Sieve Ys}
   end
end
</syntaxhighlight>