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Old 2019-02-26, 22:14   #177
VBCurtis
 
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Quote:
Originally Posted by paulunderwood View Post
The Fibonacci PRPs U(130021) and U(148091) are ripe for a multi-core Primo proof. Alternatively, there are some smaller Mersenne co-factors that need proofs.

Congrats for your latest quadruplet.
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?
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Old 2019-02-26, 22:36   #178
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Quote:
Originally Posted by VBCurtis View Post
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?
Those on this list but not on this one. I recommend at least 16 cores

I don't know about coordination. HTH.
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Old 2019-02-28, 15:48   #179
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Speaking about primo proofs:

I have a few (4 + 2) candidates of irregular and Euler irregular 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.
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Old 2019-03-01, 13:31   #180
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Quote:
Originally Posted by Batalov View Post
Speaking of other primes - Peter Kaiser's latest Quad is out there in outer space!
https://primes.utm.edu/top20/page.php?id=55

10,132 digits!

This quad has a remarkably high difficulty level! Congratulations to Peter!
Congratulations. It is truly impressive! Over twice the number of digits than the previous one (5003 digits on March 2016).
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Old 2019-03-21, 15:09   #181
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A new Generalized Fermat has been found
2733014524288 + 1
While not the largest Generalized Fermat it is (by far) the largest prime for 2019 with ‎3'374,655 digits.

Congratulations to Yair Givoni and The Planetary Society.
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Old 2019-03-24, 04:38   #182
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Default 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!
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Old 2019-04-14, 19:29   #183
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Smile 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.
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Old 2019-04-18, 19:08   #184
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A new Generalized Fermat has been found
2788032524288 + 1
While not the largest Generalized Fermat it is the largest prime for 2019 with 3'379,193 digits.

Congratulations to user "Sheep"
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Old 2019-04-19, 22:27   #185
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Default Sexy primes

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

http://primepairs.com/
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Old 2019-04-19, 22:52   #186
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Quote:
Originally Posted by paulunderwood View Post
Congrats to GEN-ERIC for the primes [p,p+6] = (18041#/14*2^39003-4)±3.

http://primepairs.com/
Congrats! However, that's a strange website with weak, incorrect statements.
Quote:
Originally Posted by http://primepairs.com/
...breaking the prior record of 11,593 digits which, according to Wikipedia, had stood for nearly a decade.
What about 6521953289619 * 2^55555 - 5 and 6521953289619 * 2^55555 + 1 (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.
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Old 2019-04-19, 23:01   #187
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Quote:
Originally Posted by Batalov View Post
Congrats! However, that's a strange website with weak, incorrect statements.

What about 6521953289619 * 2^55555 - 5 and 6521953289619 * 2^55555 + 1 (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.
I'd argue Peter's triplet is not so sexy since there is a prime at 6521953289619 * 2^55555 - 1

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.
there is a prime between 17 and 23

Last fiddled with by paulunderwood on 2019-04-19 at 23:07
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