<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">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.</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><a href="https://www.washingtonpost.com/news/speaking-of-science/wp/2016/01/20/the-newest-prime-number-is-more-than-22-million-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/</a><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">  John K Clark</font></div></div>