20040227, 03:39  #1 
Feb 2004
Sydney
7 Posts 
The 40th known Mersenne prime, 2209960111 is not PRIME!
Hello I am very new to this but to a person that is no mathamatician, when I look at the short representation of the large Mersenne Prime, I see a 1 at the end. Now if thats what you have to do to the actually number, subtract 1 to make it a prime them the above mentioned number is NOT A PRIME. I am probably illinformed and wrong with the calculations but thats what I did and then divided it with a certain number and found it to be divisible by it. Can anyone please enlighten me of what is right or wrong?
I told you i was very new!(hehehahah) 
20040227, 07:58  #2 
Aug 2002
2·3·53 Posts 
The actual number is 2 to the 20996011 power minus 1.

20040227, 15:09  #3 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
22B9_{16} Posts 
Yes, it is (2^{20996011})1 which is about 6.5 million digits long. The number is not 2209960111 (which is even), nor is it (2 X 20996011)1, nor even 2^{209960111}.

20040228, 04:17  #4  
Feb 2004
Sydney
7_{16} Posts 
NO JOKE
Quote:
Last fiddled with by illmanq on 20040228 at 04:20 

20040228, 05:07  #5 
Oct 2003
Australia, Brisbane
2·5·47 Posts 
Well, then  what is the factor????

20040228, 05:13  #6  
Nov 2003
3·5·11 Posts 
Quote:


20040228, 08:44  #7  
Dec 2003
Team China
2×3^{3} Posts 
Quote:


20040228, 22:07  #8  
Aug 2002
Portland, OR USA
2×137 Posts 
Quote:
= 2(2^104830051)(2^10483005+1) = 2(2^34943351)(2^6988670 + 2^3494335 + 1)(2^3494335+1)(2^6988670  2^3494335 + 1) = ... hmm, my binomial expansion skills are a bit rusty ... anyway, his factor is in there, but I vote for '2' as well. 

20040229, 19:32  #9 
Bemusing Prompter
"Danny"
Dec 2002
California
2318_{10} Posts 
Sounds like famebait to me...

20040302, 02:50  #10  
Feb 2004
Sydney
7 Posts 
The fctor is 19 no Fame seeking factor!
Quote:
Last fiddled with by illmanq on 20040302 at 03:00 

20040304, 02:26  #11 
Bemusing Prompter
"Danny"
Dec 2002
California
2×19×61 Posts 
Oops, meant to say "flamebait"...
Last fiddled with by ixfd64 on 20040304 at 02:27 
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