<div dir="ltr"><font size="4">It was announced<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ on Thursday that ​</div>2^77,232,917 -1 is<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ a prime number, the largest one know, ​it has </div><span style="color:rgb(0,0,0);font-family:Tahoma,Arial,Helvetica,sans-serif">23,249,425 <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">digits and is the ​</div></span>50th Known Mersenne Prime<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​.​</div></font><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:ArnhemPro,Georgia,'Times New Roman',serif;font-size:17px;line-height:26px"><a href="https://www.mersenne.org/">https://www.mersenne.org/</a><br></span></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"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">John K Clark</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"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:ArnhemPro,Georgia,'Times New Roman',serif;font-size:17px;line-height:26px"><br></span></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"><span style="font-family:ArnhemPro,Georgia,'Times New Roman',serif;font-size:17px;line-height:26px"><br></span></div></div>