Predict "M51" (discussion)

[GP2]

Originally Posted by axn

85833733 2018-11-15

An interesting choice. It already has one composite LL result returned, but by a machine with a less than stellar track record. It would be scheduled for routine double-checking about 2030 or so, but is likely to be selected for strategic double checking much sooner than that.

Overall, people seem remarkably optimistic that the surfeit of primes in the current sub-100M range will continue. On average we can expect the exponent of the next Mersenne prime to be about 1.47576 times larger than the previous one. But there have also been cases like 521/127 = 4.10 and 756839/216091 = 3.50

[gophne]

I am currently running " 123,456,791" on Prime95/GIMP;

16 June 2018

[Uncwilly]

Originally Posted by gophne

I am currently running " 123,456,791" on Prime95/GIMP;

16 June 2018

Fine, go ahead and do that. But, it is composite. It has a known factor. I will leave it to the reader to figure this out. I won't bother with your date.

And this does not count against your 3 guesses or the 60 day wait. Guess another known composite and it will.

[gophne]

Originally Posted by Uncwilly

Fine, go ahead and do that. But, it is composite. It has a known factor. I will leave it to the reader to figure this out. I won't bother with your date.

And this does not count against your 3 guesses or the 60 day wait. Guess another known composite and it will.

Oh my gosh, why is Prime95 not terminating the search on my computer. Perhaps I should terminate it myself?

[Uncwilly]

Originally Posted by gophne

Oh my gosh, why is Prime95 not terminating the search on my computer. Perhaps I should terminate it myself?

Please ask this in your sub-forum. You can get help there.

[George M]

[Uncwilly]

Originally Posted by George M

Fine, go ahead and do that. But, it is composite. It has a known factor. I will leave it to the reader to figure this out.
See rule 4
Because this is the second known composite guessed in this thread, it will count as one of your 3. If you guess 2 more, you will have to wait 60 days to guess a third.

[gophne]

Originally Posted by Uncwilly

Fine, go ahead and do that. But, it is composite. It has a known factor. I will leave it to the reader to figure this out. I won't bother with your date.

And this does not count against your 3 guesses or the 60 day wait. Guess another known composite and it will.

Hi Uncwilly

Could you double check please.

Sagemath returns "123456791" as being a prime, and Prime95 is currently running on my machine with this number.

Thanks, regards

[George M]

Originally Posted by Uncwilly

Fine, go ahead and do that. But, it is composite. It has a known factor. I will leave it to the reader to figure this out.
See rule 4
Because this is the second known composite guessed in this thread, it will count as one of your 3. If you guess 2 more, you will have to wait 60 days to guess a third.

It is not composite! I checked on the Alpertron Integer Factorisation Calculator..... but lemme check again.
...
And no it is not composite. It is a prime, according to java script divisor calculator as well, calculator script, and some other prime decomposition calculator. I have reason to believe it is prime, but f not, what are it’s factors?

Ooohhhhhh...... you mean 2^1233333331 - 1 is composite..... ahhh k

[gophne]

Originally Posted by Uncwilly

Fine, go ahead and do that. But, it is composite. It has a known factor. I will leave it to the reader to figure this out.
See rule 4
Because this is the second known composite guessed in this thread, it will count as one of your 3. If you guess 2 more, you will have to wait 60 days to guess a third.

Hi Uncwilly

Running SAGEMATH code;

%time factor(1233333331)

returns that input as "prime"

Where am I missing something?

[ET_]

Originally Posted by gophne

Hi Uncwilly

Running SAGEMATH code;

%time factor(1233333331)

returns that input as "prime"

Where am I missing something?

The Mersenne you should test is 2^1233333331 - 1