[Ecm-discuss] Need assist with an ECM-GMP program.

paul zimmermann Paul.Zimmermann at inria.fr
Ven 20 Mar 17:43:32 CET 2020


> I am getting f = 1 or f = n and res > 0 from ecm_factor with composite n.
> 
> Is there any conclusion from this, e.g. B1 was just too big or so?

f = n and res > 0 is indeed possible if B1 is too big: you have hit all
prime factors of n. Then you should reduce B1 with the same sigma value
(which is known to find some prime factors).

Paul


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