20180102, 07:36  #12  
6809 > 6502
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Aug 2003
101×103 Posts
2·4,021 Posts 
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Both of your blind ignorance and insistence on being right is starting to feel like spam. 

20180102, 08:27  #13 
Dec 2017
62_{8} Posts 
My Second Guess
982451707
If anyone is struggling to come up with a prime (for any reason) then you can head below: http://www.primos.mat.br/2T_en.html :) 
20180102, 08:42  #14  
Sep 2003
5022_{8} Posts 
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The number 1,233,333,331 is indeed a prime number but 2^{1,233,333,331}−1 has a known factor, although you have to go to Mersenne.ca to see that, because such large numbers beyond 1 billion are beyond present capability for LL testing, and are not recorded by Primenet. Last fiddled with by GP2 on 20180102 at 08:45 

20180102, 08:49  #15  
Dec 2017
2·5^{2} Posts 
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20180102, 08:53  #16 
Sep 2003
2×1,289 Posts 
First of all, 982,451,707 is a prime number, but 2^{982,451,707}−1 has a factor, click here
Secondly, take a look at this list of known Mersenne primes, and consider how improbable it is that there would be a gap with no Mersenne primes from roughly 70+ million to nearly 1 billion. Try a little harder to make reasonable guesses. 
20180102, 08:55  #17  
Feb 2017
A5_{16} Posts 
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Thanks for the info/link. I see what Uncwilly was saying now as well. I will stop the current Prime95 process on my computer. Regards Last fiddled with by gophne on 20180102 at 08:57 

20180102, 09:20  #18 
Dec 2017
2×5^{2} Posts 
Prime numbers not to pick
First of all, I will try and pick a number that is greater than a billion so they are reasonable (perhaps I should put my previous guesses in the PREDICT M50 thread). I will have my final guess at the end of this post.
Now, here are prime numbers that should not be picked if or Also, after looking at the 46th and 47th mersenne prime and the gap between both exponents, I consider my previous guess reasonable, but it doesn’t mean anything if M_n is factored, my previous guess being equal to n. So anyway, my final guess is..... Hmmm.... Last fiddled with by George M on 20180102 at 09:29 
20180102, 09:39  #19  
Banned
"Luigi"
Aug 2002
Team Italia
7^{2}×97 Posts 
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Last fiddled with by ET_ on 20180102 at 09:40 

20180102, 09:43  #20  
Dec 2017
62_{8} Posts 
Quote:
Oh, and by the way, perhaps we should put a constraint on our guesses, such that our guesses should be less than 2^32 = 4294967296 ……… It seems like 2^2252945257  1 may be prime. It has a probability of 63.7945% of being prime!! We also have another mersenne number with the exact probability: 2^2685457421  1. Funny that. Last fiddled with by George M on 20180102 at 10:06 Reason: Should be less than 2^32 because otherwise mersenne.ca can’t compute it 

20180102, 09:46  #21 
"Serge"
Mar 2008
Phi(3,3^1118781+1)/3
2^{2}×37×61 Posts 

20180102, 09:53  #22 
Dec 2017
2×5^{2} Posts 

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