Hi Mumus

Firstly I am a noob in programming c and, since I wanted to learn, I though "what the hell, might as well try this"

So I am trying to understand you code and algorithm and came on a possible error. I think I am using V5

At the end of the bool CSieveOfEratosthenes::Weave()

you have

{
                const unsigned long lCompositeCunningham1 = pCompositeCunningham1A | pCompositeCunningham1B;
                const unsigned long lCompositeCunningham2 = pCompositeCunningham2A | pCompositeCunningham2B;
                const unsigned long lCompositeBiTwin = pCompositeCunningham1A | pCompositeCunningham2A;
                pCandidateBiTwin = ~lCompositeBiTwin;
                pCandidateCunningham1 = ~lCompositeCunningham1;
                pCandidates = ~(lCompositeCunningham1 & lCompositeCunningham2 & lCompositeBiTwin);
            }
The way that I see it is you do not have a "pCandidateCunningham2 = ~lCompositeCunningham2;" This means in my opinion that you are not checking for the second series.

 Is this correct?