Arbitrary Precision Arithmetic Package for Common Lisp

[saxena@cs.albany.edu (Tushar Saxena)]

The other day, I was trying to do some arithmetic with very large
numbers and to my surprise, kcl ran out of bignum stack. I found
that in kcl you cannot calculate (expt 2 40000). I need a package
for common lisp in which I can do arbitrary presicion arithmetic.
If anyone is aware of any such package, I would be very grateful
if he/she could tell me how to get it.

Thanks

Tushar Saxena
saxena@cs.albany.edu