[ExI] New prime number found

[John Clark]

The largest known prime number has just been found, 2^74207281 -1 is prime;
it starts off as 300376 carries on for a bit and then concludes with
436351. I omitted the middle bit because the entire number is 22,338,618
digits long.

https://www.washingtonpost.com/news/speaking-of-science/wp/2016/01/20/the-newest-prime-number-is-more-than-22-million-digits-long/

  John K Clark
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