primes as linked list in lua

primes2.lua

function get_primes (n) 
  compo={}
  primes={n=nil, v=nil}
  last=primes
  for i=2,n do
    if not compo[i] then
      last.v=i
      last.n={n=nil, n=nil}
      last=last.n
      for j=i*2,n,i do
        compo[j]=true
      end
    end
  end
  return primes
end

node=get_primes(10000)
while node.n do
   print(node.v)
   node=node.n
end

t0=os.clock()
for i=0,500 do
  get_primes(10000)
end
print(os.clock()-t0)