yep Grey Wolf, thats where I got the idea from :-) Appreciate your help anyway.
and yes I want to see how far I can get. I wanna experiment a bit with bignum up to a 100,000,000 digits is there any chance that MPIR would be up for a job ???
and thank you all for your anwers
Probably. Most big num libs restrict you mainly on the amount of memory your system offers, and on the resources required to perform operations on such numbers.