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Unbeliever[_4_] Unbeliever[_4_] is offline
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Default 'No practical use' for 17-million digit prime number

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

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


Because an apprentice found it and you cannot verify if he foundit first?