append(Rlist, REClist, Olist), % why is REClist sufficiently
instantiated here??
Let's lift this out of the context of your program.
Take the query:
?- append([1,2,3],R,Out).
Clearly, the second argument of append is not instantiated - it is free.
Still, this query makes sense and executes fine.
Try it at home and tell us what you find weird about the answer to the
query.
You also ask about more efficient versions of generating primes ...
google for Erathostenes (sieve and Prolog might narrow things down).
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