Merry Christmas and a prime! (M50 related) - Page 21

a1call · 2018-01-01, 00:55

What if there's a power outage?

a1call · 2018-01-01, 00:57

Quote:

Originally Posted by kladner

I don't have a horse in that race,either, but I believe voting is locked, pending verification.

I was just being cute.

kladner · 2018-01-01, 01:00

Quote:

Originally Posted by a1call

I was just being cute.

Comprendo.

rudy235 · 2018-01-01, 02:38

Quote:

Originally Posted by DanielBamberger

Why the restriction P = 1 mod 4?

Mersennes with p = 4n+1 {like 5, 13,17, 61, 89, 521...} end in 1 so Mersennes -2 would end in 9. The other Mersennes where p =4n+3 like {7, 19, 31, 107, 127} end in 7 so the final number would end in 5.

Batalov · 2018-01-01, 03:00

Good thinking! You just eliminated half of the hypothetical M50s.

Now, how many of them have ten of the same digit in a row in their decimal expansion? That's a pretty good leak, really. And it does have them, and a few eight-ers-in-a-row which is of course par for the course for any number of this size.

DanielBamberger · 2018-01-01, 03:56

Quote:

Originally Posted by rudy235

Mersennes with p = 4n+1 {like 5, 13,17, 61, 89, 521...} end in 1 so Mersennes -2 would end in 9. The other Mersennes where p =4n+3 like {7, 19, 31, 107, 127} end in 7 so the final number would end in 5.

D'oh, I see! Thanks!

Madpoo · 2018-01-01, 04:10

Not sure who, but someone added an entry to the Mersenne prime wiki page to announce M50.

One problem... the exponent they listed is incorrect.

I edited it to remove M50 from the chart, but it appears someone got a little jumpy. Don't know if it was someone here or not?

The exponent they listed was M77,196,191 and I think that came up somewhere earlier in this thread based on the time of the result and the user account. But that user submits many results and it just so happened that a few different ones came in that day... doesn't mean anything.

Well, once the press release goes out, whoever added that will know for sure they had the wrong one, but c'mon folks... let's just have ourselves an awesome New Year's Eve (and sober up Monday) and the official press release won't be far behind.

DanielBamberger · 2018-01-01, 04:40

Quote:

Originally Posted by Madpoo

Not sure who, but someone added an entry to the Mersenne prime wiki page to announce M50.
[...]
I edited it to remove M50 from the chart, but it appears someone got a little jumpy. Don't know if it was someone here or not?

It wasn't me.
But I'm pretty active over there, and I'm unable to find the edit. Sure it was on https://en.wikipedia.org/wiki/Mersenne_prime? Last edit 07:58, 24 December 2017‎.

Madpoo · 2018-01-01, 04:41

Quote:

Originally Posted by DanielBamberger

It wasn't me.
But I'm pretty active over there, and I'm unable to find the edit. Sure it was on https://en.wikipedia.org/wiki/Mersenne_prime? Last edit 07:58, 24 December 2017‎.

It's this page:
https://en.wikipedia.org/wiki/Great_...e_Prime_Search

DanielBamberger · 2018-01-01, 04:53

Quote:

Originally Posted by Madpoo

It's this page:
https://en.wikipedia.org/wiki/Great_...e_Prime_Search

OK. I tried to repair the article (there were some issues with the several attempts to undo the revision). I linked your post, so if the user comes back he/she will see your explanation.

MattcAnderson · 2018-01-01, 04:54

Happy New Year,

I eagerly await the press release for the 50th known Mersenne.

Regards,
Matt

2018-01-01, 03:00	#225
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9,497 Posts	Good thinking! You just eliminated half of the hypothetical M50s. Now, how many of them have ten of the same digit in a row in their decimal expansion? That's a pretty good leak, really. And it does have them, and a few eight-ers-in-a-row which is of course par for the course for any number of this size. Last fiddled with by Batalov on 2018-01-01 at 04:28

2018-01-01, 04:10	#227
Madpoo Serpentine Vermin Jar Jul 2014 CF1₁₆ Posts	Wiki addition? Really? Not sure who, but someone added an entry to the Mersenne prime wiki page to announce M50. One problem... the exponent they listed is incorrect. I edited it to remove M50 from the chart, but it appears someone got a little jumpy. Don't know if it was someone here or not? The exponent they listed was M77,196,191 and I think that came up somewhere earlier in this thread based on the time of the result and the user account. But that user submits many results and it just so happened that a few different ones came in that day... doesn't mean anything. Well, once the press release goes out, whoever added that will know for sure they had the wrong one, but c'mon folks... let's just have ourselves an awesome New Year's Eve (and sober up Monday) and the official press release won't be far behind.

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