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Mersenne prime numbers can be expressed as 2^n - 1.
The 50th known Mersenne was discovered Dec 26 2017.
It is 2^77232917 - 1.
It has more than 23 million digits.
What can you do about it?
Well, Mersenne.org is asking for donations. And, if you have a reasonably fast PC that you can leave running for a week or two, you can join the hunt for number 51 and get your name in the math history books. See their website:
Was too busy with my Wife's 50th birthday that day to worry about maths.
"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible." - Mr.Prakash One Fine Saturday. 24/04/2004