Long[] workLoad = new Long[primes.size()];
workLoad = primes.toArray(workLoad);

pool = new ForkJoinPool();
ForkJoinWorker worker = new ForkJoinWorker(workLoad, q, partitionSize, 0);
pool.execute(worker);

resultList =  worker.invoke();

ForkJoinWorker f = new ForkJoinWorker(..);
f.fork();
List<Long> results = calcFactors(...);
results.addAll(f.join);
return results;