/**
* Filter non-primes
*
* @param numbers
*/
private ATermList filterNonPrimes(ATermList numbers) {
ATermList primes = factory.makeList();
numbers = numbers.getNext();
while (!numbers.isEmpty()) {
ATermInt prime = (ATermInt) numbers.getFirst();
numbers = filterMultiples(prime.getInt(), numbers);
primes = primes.append(prime);
}
return factory.makeList(factory.makeInt(1), primes);
}
