BigInteger, What Are They?
(From sun.com) "Immutable arbitrary-precision integers."
should be used whenever you need to handle very large numbers, anything larger then 'long' variables. Long's have a max a max value of 9223372036854775807. As well, BigInteger provides some useful functions
for bit manipulation, GCD, random number, and primality testing and generation.
http://compsci.ca/v3/viewtopic.php?t=13193
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