mersenneforum.org (https://www.mersenneforum.org/index.php)
-   Riesel Prime Search (https://www.mersenneforum.org/forumdisplay.php?f=59)
-   -   Other Primes (https://www.mersenneforum.org/showthread.php?t=6374)

 VBCurtis 2019-02-26 22:14

[QUOTE=paulunderwood;509527]The Fibonacci PRPs [URL="https://primes.utm.edu/top20/page.php?id=39"]U(130021) and U(148091)[/URL] are ripe for a multi-core Primo proof. Alternatively, there are some smaller Mersenne co-factors that need proofs.

Congrats for your latest quadruplet.[/QUOTE]

I'll take on one of the mersenne cofactors; is there a place where some proofs are reserved, or a list of which need primo proofs?

 paulunderwood 2019-02-26 22:36

[QUOTE=VBCurtis;509537]I'll take on one of the mersenne cofactors; is there a place where some proofs are reserved, or a list of which need primo proofs?[/QUOTE]

Those on [URL="http://www.primenumbers.net/prptop/searchform.php?form=%282%5Ep-1%29%2Fn&action=Search"]this list[/URL] but not on [URL="https://primes.utm.edu/top20/page.php?id=49"]this one[/URL]. I recommend at least 16 cores :wink:

I don't know about coordination. HTH.

 Thomas11 2019-02-28 15:48

Speaking about primo proofs:

I have a few (4 + 2) candidates of [URL="https://primes.utm.edu/top20/page.php?id=26"]irregular[/URL] and [URL="https://primes.utm.edu/top20/page.php?id=25"]Euler irregular[/URL] primes waiting for a primo primality proof.

They are ranging from about 22000 to 29000 digits, but are far beyond my current computing resources.

If one of you is (seriously) interested, please drop me a note.

 rudy235 2019-03-01 13:31

[QUOTE=Batalov;509446]Speaking of other primes - Peter Kaiser's latest Quad is out there in outer space!
[url]https://primes.utm.edu/top20/page.php?id=55[/url]

[B]10,132 digits! [/B]

This quad has a remarkably high difficulty level! Congratulations to Peter![/QUOTE]

Congratulations. It is truly impressive! Over twice the number of digits than the previous one (5003 digits on March 2016).

 rudy235 2019-03-21 15:09

A new Generalized Fermat has been found
2733014[SUP]524288[/SUP] + 1
While not the largest Generalized Fermat it is (by far) the largest prime for [B]2019[/B] with ‎3'374,655 digits.

Congratulations to Yair Givoni and [URL="http://www.planetary.org/"]The Planetary Society.[/URL]

 rudy235 2019-03-24 04:38

4 primes in Arithmetic Progresison

2 Sets
Largest examples for an AP-4

a) 1027676400 · 60013# + 1 (4th term) 25992 digits

b) 1025139165 · 60013# + 1 (4th term) 25992 digits

By Ken J. Davis

Congratulations!

 Harvey563 2019-04-14 19:29

new Generalized Woodall

321671*34^321671-1 (492638 digits) is the ninth largest known Generalized Woodall prime, and the ninth known prime of the form n*34^n-1.

 rudy235 2019-04-18 19:08

A new Generalized Fermat has been found
2788032[SUP]524288[/SUP] + 1
While not the largest Generalized Fermat it is the largest prime for [B]2019[/B] with 3'379,193 digits.

Congratulations to user "Sheep"

 paulunderwood 2019-04-19 22:27

Sexy primes

Congrats to GEN-ERIC for the primes [p,p+6] = (18041#/14*2^39003-4)±3.

[url]http://primepairs.com/[/url]

 Batalov 2019-04-19 22:52

[QUOTE=paulunderwood;514161]Congrats to GEN-ERIC for the primes [p,p+6] = (18041#/14*2^39003-4)±3.

[url]http://primepairs.com/[/url][/QUOTE]
Congrats! However, that's a strange website with weak, incorrect statements.
[QUOTE=http://primepairs.com/]...breaking the prior record of 11,593 digits which, according to Wikipedia, had stood for nearly a decade.[/QUOTE]
What about 6521953289619 * 2^55555 - 5 and [URL="https://primes.utm.edu/primes/page.php?id=114018"]6521953289619 * 2^55555 + 1[/URL] (16737d) dated Apr 2013?
Should one think that Peter immediately rushes to Wikipedia to update his record for posterity after finding a record? I am sure that he has other better things to do. Or maybe someone else does for him? Also probably not.

There is a reason why even school teachers don't give children a grade for a quote from Wiki. Wiki is broadly correct in generalities, and overwhelmingly incorrect in expert details.
The algorithm for searching for facts is: start with a general blurp from Wikipedia, continue searching using links and links from links... then you might build some semblance of a current state of the art.

 paulunderwood 2019-04-19 23:01

[QUOTE=Batalov;514163]Congrats! However, that's a strange website with weak, incorrect statements.

What about 6521953289619 * 2^55555 - 5 and [URL="https://primes.utm.edu/primes/page.php?id=114018"]6521953289619 * 2^55555 + 1[/URL] (16737d) dated Apr 2013?
Should one think that Peter immediately rushes to Wikipedia to update his record for posterity after finding a record? I am sure that he has other better things to do. Or maybe someone else does for him? Also probably not.

There is a reason why even school teachers don't give children a grade for a quote from Wiki. Wiki is broadly correct in generalities, and overwhelmingly incorrect in expert details.
The algorithm for searching for facts is: start with a general blurp from Wikipedia, continue searching using links and links from links... then you might build some semblance of a current state of the art.[/QUOTE]

I'd argue Peter's triplet is not so sexy since there is a prime at 6521953289619 * 2^55555 - 1 :boxer:

On the other hand:

[QUOTE]Prime pairs with a prime gap of 6 are known as sexy primes (p, p+6).
e.g., (5, 11), (7, 13), (11, 17), (13, 19), (17, 23), etc. [/QUOTE]

there is a prime between 17 and 23 :down:

All times are UTC. The time now is 15:04.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.