kaleb_pederson wrote:
> Number isn't suitable for my needs; it allows for very large 
> numbers, but its precision is limited to 53-bits.  I need between 
> 1024 and 4096 bit precision.  Specifically, I will need to generate 
> prime numbers that are between 128 and 512 decimal digits in length, 
> determine if numbers are relatively prime with those numbers, etc.  

If you don't mind porting some Javascript, Leemon Baird has written a 
public-domain Javascript library for handling arbitrary-precision 
arithmetic that you can try out and get the source code to here:

http://www.leemon.com/crypto/BigInt.html

If you're planning on doing a lot of such heavy lifting, I suspect that 
you'd likely see markedly better performance using a numerical analysis 
library compiled with processor-specific optimizations into native code, 
but to each his own....

Jim Cheng
effectiveUI

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