In message , Rod Speed
writes


"ARW" wrote in message
...
http://www.bbc.co.uk/news/uk-21382663

Why is it only "thought" to be the largest prime number ever identified?

Because (large) prime numbers are used in all encryption systems. These
systems rely for security on no-one being able to predict where to find
'new' or existing primes. If someone has worked out how to do it, they
won't shout about it because they'll be in control of everybody else's
private information.
Because no one has claimed a larger one YET.

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Nick (=----)