21 Dec
2007
21 Dec
'07
8:08 a.m.
@apfelmus, please read my code. I introduced DivIter to separate divstep from divisions. But it stores intsqrt dividend also. Thus the sqrt is only recomputed, when a new factor is found. Concerning primes': With the sieve of Eratosthenes we cannot make a lazy list, we need the whole list at any point of computation. And beyond the end we fall back to x -> x+2. This is the difference to the list of summands i proposed. And we have the arbitrary choice of [2,4], [2,4,2,4,2,4,2,6,2,6] or any longer. Concerning State: There is useful instruction by Ryan Ingram too here. I will study that and yours. Thank you ! Cheers, Joost