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Still 2 months before the end of this year.
Current Total Mega Primes: 187
Pending Mega Prime: 1
Goal: 12 Mega Primes still to find. 6 by month. Too easy ;)
A good Christmas gift for PrimeGrid and all of us :)
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Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

That pending mega prime was a 1.7 million digit GFN18, which was found by Scott Brown. It brings our total for 2017 to 53, which ties the record from 2016.
So far this year there have been 31 PPSMEGAs, 18 GFNs, 2 SR5s, 1 PSP, and 1 GCW. Of particular note were the GFN20 (only known GFN20) and the PSP (first prime from the PSP project in 7 years.)
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My lucky number is 75898^{524288}+1 



Still 2 months before the end of this year.
Current Total Mega Primes: 187
Pending Mega Prime: 1
Goal: 12 Mega Primes still to find. 6 by month. Too easy ;)
A good Christmas gift for PrimeGrid and all of us :)
With 12 AVX/AVX2 cores running 24/7/365 in average I found 23 primes per year ( above 500K)
So when I sow that someone say it is too easy to find 12 primes in two month I only can ask myself: how many cores does you have :)
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92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

Still 2 months before the end of this year.
Current Total Mega Primes: 187
Pending Mega Prime: 1
Goal: 12 Mega Primes still to find. 6 by month. Too easy ;)
A good Christmas gift for PrimeGrid and all of us :)
With 12 AVX/AVX2 cores running 24/7/365 in average I found 23 primes per year ( above 500K)
So when I sow that someone say it is too easy to find 12 primes in two month I only can ask myself: how many cores does you have :)
I think he meant for all of PrimeGrid. That's a whole lot of computers. :)
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My lucky number is 75898^{524288}+1 



I just started two months ago here on PrimeGrid and have had the honor of double checking a recent PPSMega Prime. Very exciting. I was just moving from one project to another trying to figure out which Prime hunt is for me. 



I just started two months ago here on PrimeGrid and have had the honor of double checking a recent PPSMega Prime. Very exciting. I was just moving from one project to another trying to figure out which Prime hunt is for me.
That's nice, congrats !
I joined PG 4 days before you did and have only found some short AP's, but no primes.
Let's keep crunching ! 



Still 2 months before the end of this year.
Current Total Mega Primes: 187
Pending Mega Prime: 1
Goal: 12 Mega Primes still to find. 6 by month. Too easy ;)
A good Christmas gift for PrimeGrid and all of us :)
With 12 AVX/AVX2 cores running 24/7/365 in average I found 23 primes per year ( above 500K)
So when I sow that someone say it is too easy to find 12 primes in two month I only can ask myself: how many cores does you have :)
Unfortunately, not enough ;) ... never enough...
But I was speaking for Primegrid, not only me.
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



I just started two months ago here on PrimeGrid and have had the honor of double checking a recent PPSMega Prime. Very exciting. I was just moving from one project to another trying to figure out which Prime hunt is for me.
That's nice, congrats !
I joined PG 4 days before you did and have only found some short AP's, but no primes.
Let's keep crunching !
Thanks, just started the SR5 project. I like the compute times. 



31Oct2017: 12 primes remain to achieve goal (200)
03Nov2017: 11 primes remain to achieve goal (200) 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144+1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144 + 1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
16Nov2017: 9 primes remain to achieve 200 Mega Prime goal  3596074^262144 + 1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144 + 1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
16Nov2017: 9 primes remain to achieve 200 Mega Prime goal  3596074^262144 + 1
28Nov2017: 8 primes remain to achieve 200 Mega Prime goal  1155*2^3446253+1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


compositeVolunteer tester Send message
Joined: 16 Feb 10 Posts: 820 ID: 55391 Credit: 729,693,888 RAC: 397,575

A dash of pessimism^H^H^H^H^H^H^H^H^Hrealism: averaging 1 Mega Prime per week, the goal will be a few short of being met. These shortunit challenges lately are not helping. 



A dash of pessimism^H^H^H^H^H^H^H^H^Hrealism: averaging 1 Mega Prime per week, the goal will be a few short of being met. These shortunit challenges lately are not helping.
Agree. Now in December. 8 primes to found in 4 weeks. But...
... we can rely on Santa Claus to come up with prime numbers in his hood ...
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144 + 1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
16Nov2017: 9 primes remain to achieve 200 Mega Prime goal  3596074^262144 + 1
28Nov2017: 8 primes remain to achieve 200 Mega Prime goal  1155*2^3446253+1
03Dec2017: 7 primes remain to achieve 200 Mega Prime goal  3673932^262144+1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144 + 1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
16Nov2017: 9 primes remain to achieve 200 Mega Prime goal  3596074^262144 + 1
28Nov2017: 8 primes remain to achieve 200 Mega Prime goal  1155*2^3446253+1
03Dec2017: 7 primes remain to achieve 200 Mega Prime goal  3673932^262144+1
04Dec2017: 6 primes remain to achieve 200 Mega Prime goal  1065*· 2^3447906 + 1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


compositeVolunteer tester Send message
Joined: 16 Feb 10 Posts: 820 ID: 55391 Credit: 729,693,888 RAC: 397,575

I think I have a live PPSMEGA on the line.
It's took 50% longer than it's neighbours on the same CPU.
EDIT: Or maybe not. The processor might have been throttling. 



It will help for sure... Unfortunately, I'm no more so optimistic about 200 mega primes before the end of the year. But still hopping. 20 days remaining.
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

I think I have a live PPSMEGA on the line.
It's took 50% longer than it's neighbours on the same CPU.
EDIT: Or maybe not. The processor might have been throttling.
PPSMEGAs do not take longer when it's a prime.
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My lucky number is 75898^{524288}+1 



We will discover another PPSMega prime within Friday. I feel it. 



Seems there is 1 less  when looking at TRP :) 



Yes, and a big one. Only 5 left to find.
1 SOB
1 PSP
1 WOO
1 CUL
1 ESP or GN 22
And we will finish the year in apotheosis. :)
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144 + 1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
16Nov2017: 9 primes remain to achieve 200 Mega Prime goal  3596074^262144 + 1
28Nov2017: 8 primes remain to achieve 200 Mega Prime goal  1155*2^3446253+1
03Dec2017: 7 primes remain to achieve 200 Mega Prime goal  3673932^262144+1
04Dec2017: 6 primes remain to achieve 200 Mega Prime goal  1065* 2^3447906 + 1
13Dec2017: 5 primes remain to achieve 200 Mega Prime goal  273809*2^89324161
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



I lost my bet, although two other megaprimes were discovered. :)
I think to find 1 SOB now is almost impossible. We're doublechecking. 



I lost my bet, although two other megaprimes were discovered. :)
I think to find 1 SOB now is almost impossible. We're doublechecking.
That the purpose of the double checking. If I well remember, 2 SOB primes were discovered during double checking (not on PrimeGrid but on SOB).
Don't abandon hope all ye who enter here.... :) :) :)
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

That the purpose of the double checking. If I well remember, 2 SOB primes were discovered during double checking (not on PrimeGrid but on SOB).
Not only do you remember correctly, but I am fairly certain we're beyond the point where the SoB project had run its earlier double checks. None of this has been double checked before. Finding a missed prime here is not beyond the realm of possibility.
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My lucky number is 75898^{524288}+1 



I lost my bet, although two other megaprimes were discovered. :)
I think to find 1 SOB now is almost impossible. We're doublechecking.
That the purpose of the double checking. If I well remember, 2 SOB primes were discovered during double checking (not on PrimeGrid but on SOB).
Don't abandon hope all ye who enter here.... :) :) :)
Well, there are still more chances to discover a PPS or GFN megaprime, I guess. I put my hope on them. ;D
[...] None of this has been double checked before. Finding a missed prime here is not beyond the realm of possibility.
Glad to know. A good reason to move my CPU to SoB after PPSMEGA and GFN17 will not be eligible to get announced with PDF documents anymore. 



5 SoB will be better, than your list.
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(252^65481)^22 is prime! Small, but mine.
134137784^32768+1(DC)
107853608^8192+1(DC)
10465966^16384+1(DC)




With 5 SOB, we will finish the project. It will be a good year :)
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Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



A PPS megaprime discovered ==> 4 megaprimes
We have time to discover another one.
Close (<48h) discoveries of these numbers happened many times. 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

A PPS megaprime discovered ==> 4 megaprimes
We have time to discover another one.
Close (<48h) discoveries of these numbers happened many times.
I'm hoping the next mega prime is an SoB found during the challenge. This will be the first concerted effort (aka "challenge"!) we've done on old SoB work that wasn't double checked. Considering the history, I am more optimistic than usual about our chances. Plus, we've been unusually lucky recently. In the last year or so, we've found an SoB (first ever for PrimeGrid), a PSP (first ever for PrimeGrid), and a GFN20 (first ever, period). That's 21.3 million digits between the three of them. (Which is still about a million digits short of the current largest Mersenne prime!!!)
____________
My lucky number is 75898^{524288}+1 



31Oct2017: 12 primes remain to achieve 200 Mega Prime goal  3547726^262144 + 1
03Nov2017: 11 primes remain to achieve 200 Mega Prime goal  943 * 2^3440196 + 1
13Nov2017: 10 primes remain to achieve 200 Mega Prime goal  943 *2^3442990 + 1
16Nov2017: 9 primes remain to achieve 200 Mega Prime goal  3596074^262144 + 1
28Nov2017: 8 primes remain to achieve 200 Mega Prime goal  1155*2^3446253+1
03Dec2017: 7 primes remain to achieve 200 Mega Prime goal  3673932^262144+1
04Dec2017: 6 primes remain to achieve 200 Mega Prime goal  1065* 2^3447906 + 1
13Dec2017: 5 primes remain to achieve 200 Mega Prime goal  273809*2^89324161
28Dec2017: 4 primes remain to achieve 200 Mega Prime goal  1155*2^3455254+1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



we'll be a little short I'm afraid.
So, what could we expect for 2018? 50 new mega primes with a total of 250 seems easily doable.
100 with a total of 300 doesn't seems reasonable. But we can have a good surprise with primes distribution in the upcoming ranges. Who knows?
So, what's your prognostic for 2018 ?
Mine: 267 Mega Primes
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


MonkeydeeVolunteer tester
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I couldn't even begin to guess how many mega primes we'll find in 2018.
What I would like to see is significant progress made on knocking k's out of the conjectures. I would love to see the SoB double check yield at least one prime. Multiple SR5 primes would be great too.
I would really love to see one of the conjectures proven in the next few years.
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My Primes
Badge Score: 2*1 + 4*2 + 6*2 + 7*11 + 10*4 = 139




I would really love to see one of the conjectures proven in the next few years.
I would love that as well, but think that would be overly optimistic. Even seeing just a few K eliminated from any of the conjectures will greatly speed up work on the remaining K (with the exception of TRP and SR5 that have lots of Ks left).
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Michael GoetzVolunteer moderator Project administrator
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Looks like we've got 197, a GFN 17 Mega. Verification is being done now.
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My lucky number is 75898^{524288}+1 



Looks like we've got 197, a GFN 17 Mega. Verification is being done now.
Happy 2018 with the first one of the year, and hopefully many more to follow! 



Looks like we've got 197, a GFN 17 Mega. Verification is being done now.
I just wondering where is 131072 MEGA prime. If you make quick table of exponents then this is far largest difference in exponent on this project. Average is about 299.000 and here is nearly 1.1M :)
But we found it: I now expect few ones together ( or near by) to lower average value :)
____________
92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 



We miss last year goal and there is no more goal for this year, but I can maintain this list for a while, at least to 200 MP, if someone has some interest in it. I would like to add links to primes.edu, but unfortunately, if I want fixed font size (pre tag), I can't use url tag. Not sure it will be useful.
31Oct2017: 188 Mega Prime: GFN18 : 3547726^262144 + 1
03Nov2017: 189 Mega Prime: PPSMega: 943 * 2^3440196 + 1
13Nov2017: 190 Mega Prime: PPSMega: 943 *2^3442990 + 1
16Nov2017: 191 Mega Prime: GFN18 : 3596074^262144 + 1
28Nov2017: 192 Mega Prime: PPSMega: 1155*2^3446253 + 1
03Dec2017: 193 Mega Prime: GFN18 : 3673932^262144 + 1
04Dec2017: 194 Mega Prime: PPSMega: 1065* 2^3447906 + 1
13Dec2017: 195 Mega Prime: TRP : 273809*2^8932416  1
28Dec2017: 196 Mega Prime: PPSMega: 1155*2^3455254 + 1

08Jan2018: 197 Mega Prime: GFN17 : 48273828^131072 + 1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



31Oct2017: 188 Mega Prime: GFN18 : 3547726^262144 + 1
03Nov2017: 189 Mega Prime: PPSMega: 943 * 2^3440196 + 1
13Nov2017: 190 Mega Prime: PPSMega: 943 *2^3442990 + 1
16Nov2017: 191 Mega Prime: GFN18 : 3596074^262144 + 1
28Nov2017: 192 Mega Prime: PPSMega: 1155*2^3446253 + 1
03Dec2017: 193 Mega Prime: GFN18 : 3673932^262144 + 1
04Dec2017: 194 Mega Prime: PPSMega: 1065* 2^3447906 + 1
13Dec2017: 195 Mega Prime: TRP : 273809*2^8932416  1
28Dec2017: 196 Mega Prime: PPSMega: 1155*2^3455254 + 1

08Jan2018: 197 Mega Prime: GFN17 : 48273828^131072 +
10Jan2018: 198 Mega Prime: GFN18 : 3853792^262144 + 1
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



Why not start a new thread for 2018
____________
Largest Primes to Date:
As Double Checker: SR5 109208*5^1816285+1 Dgts1,269,534
As Initial Finder: SR5 243944*5^12585761 Dgts879,713




neometal
We miss last year goal and there is no more goal for this year, but I can maintain this list for a while, at least to 200 MP, if someone has some interest in it. I would like to add links to primes.edu, but unfortunately, if I want fixed font size (pre tag), I can't use url tag. Not sure it will be useful.
There's no goal setup in a palatable for our brains that's realistic. 2018 goal 300MP is unrealistic and 2018 goal 268 doesn't have the effect. Also it was run aillas, if you wish to start your own thread go ahead. 



I was thinking a thread listing of all mega primes (for 2018 and new thread for 2019 etc.) since not all (only top 100 on T5K list) will be posted in NEWS section. We should have a list such as how Mike posts all GFN, APs 25 and above. Don't know if Mike would take this on (he already has enough on his plate) or someone who keeps up on mega primes on a daily basis who would keep such a list going.
Any volunteers. I would, but my disability forces many stays in a hospital and strange sleep patterns.
____________
Largest Primes to Date:
As Double Checker: SR5 109208*5^1816285+1 Dgts1,269,534
As Initial Finder: SR5 243944*5^12585761 Dgts879,713




I can start a new one for 2018. As we won't have new announcement for MP now :)
But the list will be simple, with no details as Michael does for MP or GFN announcement. Not sure I will be able to get those information easily. I can add digit number as info.
But not sure it's really useful. Primegrid already maintain such a list : PrimeGrid Mega Primes on the main page. Just an extract for 2018. If you want a list sorted by date you use the other link PrimeGrid Primes by Project also.
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



I can start a new one for 2018. As we won't have new announcement for MP now :)
But the list will be simple, with no details as Michael does for MP or GFN announcement. Not sure I will be able to get those information easily. I can add digit number as info.
Related posts starting at and then down:http://www.primegrid.com/forum_thread.php?id=7767&nowrap=true#113251
____________
Largest Primes to Date:
As Double Checker: SR5 109208*5^1816285+1 Dgts1,269,534
As Initial Finder: SR5 243944*5^12585761 Dgts879,713



Michael GoetzVolunteer moderator Project administrator
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#199 is a GFN19, assuming it passes the necessary tests.
EDIT: The plot thickens... Either there's been an error in a GPU, a bug in the software, or we've actually found a Genefer PRP that is in fact composite.
The initial test from Genefer on the host computer was PRP. Running the Genefer primality test on one of our GPUs said it was composite. The primality test is being repeated on another GPU, and, of course, the standard LLR test is in progress. The LLR test will take a while, however.
EDIT 2: It's looking more and more like a problem with the primality test in Genefer, which is a relatively new feature we don't use often. LLR should finish in about 5 hours with a definitive answer, but it's looking really good that this number is indeed prime.
____________
My lucky number is 75898^{524288}+1 



#199 is a GFN19, assuming it passes the necessary tests.
EDIT: The plot thickens... Either there's been an error in a GPU, a bug in the software, or we've actually found a Genefer PRP that is in fact composite.
The initial test from Genefer on the host computer was PRP. Running the Genefer primality test on one of our GPUs said it was composite. The primality test is being repeated on another GPU, and, of course, the standard LLR test is in progress. The LLR test will take a while, however.
EDIT 2: It's looking more and more like a problem with the primality test in Genefer, which is a relatively new feature we don't use often. LLR should finish in about 5 hours with a definitive answer, but it's looking really good that this number is indeed prime.
Crazy and exciting. There were GFN19 finds in Nov 2011, Jun 2012, Jul 2012, and Aug 2012, but we have been witnessing a "hole" and no new ones have been found for almost 5.5 years.
It would be quite sensational if this were a nonprime PRP ("pseudoprime") (MathOverflow question by myself). But it is more likely to be either not a PRP after all (hence composite and not interesting) or a genuine prime.
/JeppeSN 



EDIT 2: It's looking more and more like a problem with the primality test in Genefer, which is a relatively new feature we don't use often. LLR should finish in about 5 hours with a definitive answer, but it's looking really good that this number is indeed prime.
If I may ask, how you know " but its looking really good that this number is indeed prime" 5 hours before LLR will finish test :)
____________
92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

It would be quite sensational if this were a nonprime PRP ("pseudoprime") (MathOverflow question by myself). But it is more likely to be either not a PRP after all (hence composite and not interesting) or a genuine prime.
It's definitely PRP. Genefer has been run on three different computers, including the wingman of the original BOINC task, and all came back as PRP.
If I may ask, how you know " but its looking really good that this number is indeed prime" 5 hours before LLR will finish test :)
The reason I say it's looking like a problem with the Genefer Primality test is that we've had three different computers run the primality test (two were Jim's, one was mine), and although they all came back as composite, they came back with three different residues. Something's clearly wrong with that primality test.
Everything points to the Genefer primality test having a problem. Since that's the only thing unusual, there's no reason to suggest that this PRP is any less likely to be prime than all the other PRPs found by Genefer.
____________
My lucky number is 75898^{524288}+1 



I was thinking there is some hidden LLR feature that show in advance candidate can be prime before test finish.
Thanks for answer.
____________
92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 



This is quite exciting, one way or the other. I think you probably have enough compute power already, but if you need somebody else to check on a different machine, I'm up for the task :). 



We just need to wait about 3.5 hours and all will be clear :)
____________
92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

We just need to wait about 3.5 hours and all will be clear :)
According to Yves, besides there being a problem with rounding in the primality test (the root cause of the problem), between the original PRP test (2prp) and the first two passes of the primality test (Euler 7prp and 11prp) there's already proof that number can not be composite and must be prime. Waiting for LLR to finish is therefore only a formality, but we'll wait anyway.
____________
My lucky number is 75898^{524288}+1 



We just need to wait about 3.5 hours and all will be clear :)
According Yves, besides there being a problem with rounding in the primality test (the root cause of the problem), between the original PRP test (2prp) and the first two passes of the primality test (Euler 7prp and 11prp) there's already proof that number can not be composite and must be prime. Waiting for LLR to finish is therefore only a formality, but we'll wait anyway.
So we have new big prime :)))
YEEEE :)
____________
92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13625 ID: 53948 Credit: 273,429,375 RAC: 257,134

All the intrigue is over:
1880370^524288 + 1
____________
My lucky number is 75898^{524288}+1 



All the intrigue is over:
1880370^524288 + 1
It has plenty of zeros up to the end :)
Congratulations to person that make discovery!
____________
92*10^^{1439761}1 NEARREPDIGIT PRIME :) :) :)
314187728^^{131072}+1 GENERALIZED FERMAT
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 


HonzaVolunteer moderator Volunteer tester Project scientist Send message
Joined: 15 Aug 05 Posts: 1904 ID: 352 Credit: 3,731,871,205 RAC: 5,590,648

All the intrigue is over:
1880370^524288 + 1
Seventh largest prime by PG, largest by Scott and will put him from 8th to 6th place in top prime finder by score list.
Well done.
____________
My stats
Badge score: 1*1 + 5*1 + 8*3 + 9*11 + 10*1 + 11*1 + 12*3 = 186 



Incredible found. Congrats to the finder and all.
Hum... Do you see the GFN prime sequence in January... GFN 17, 18 and 19... Next 20 and 21? :)
31Oct2017: 188 Mega Prime: GFN18 : 3547726^262144 + 1
03Nov2017: 189 Mega Prime: PPSMega: 943 * 2^3440196 + 1
13Nov2017: 190 Mega Prime: PPSMega: 943 *2^3442990 + 1
16Nov2017: 191 Mega Prime: GFN18 : 3596074^262144 + 1
28Nov2017: 192 Mega Prime: PPSMega: 1155*2^3446253 + 1
03Dec2017: 193 Mega Prime: GFN18 : 3673932^262144 + 1
04Dec2017: 194 Mega Prime: PPSMega: 1065* 2^3447906 + 1
13Dec2017: 195 Mega Prime: TRP : 273809*2^8932416  1
28Dec2017: 196 Mega Prime: PPSMega: 1155*2^3455254 + 1

08Jan2018: 197 Mega Prime: GFN17 : 48273828^131072 + 1
10Jan2018: 198 Mega Prime: GFN18 : 3853792^262144 + 1
15Jan2018: 199 Mega Prime: GFN19 : 1880370^524288 + 1
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Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 



All the intrigue is over:
1880370^524288 + 1
I will write a comment in OEIS A243959 once the official announcement is there. Note that we do not know yet if 1880370 is the 5th member (not all smaller bases have been checked); we only know it is a member. /JeppeSN 


Michael GoetzVolunteer moderator Project administrator
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Looks like PrimeGrid's 200th mega prime will be a GFN17Mega. More details once it's confirmed.
____________
My lucky number is 75898^{524288}+1 


Yves GallotVolunteer developer Project scientist Send message
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Running the Genefer primality test on one of our GPUs said it was composite. [...]
With ocl2 transform, we have
Testing 1880370^524288+1...
Using OCL2 transform
Starting initialization...
Initialization complete (2.139 seconds).
Estimated time for 1880370^524288+1 is 1:02:00
1880370^524288+1 is an Euler probable prime to base 7. (3289511 digits) (err = 0.0000) (time = 1:03:59) 10:54:03
Testing 1880370^524288+1...
Using OCL2 transform
Starting initialization...
Initialization complete (2.077 seconds).
Estimated time for 1880370^524288+1 is 1:04:00
1880370^524288+1 is an Euler probable prime to base 11. (3289511 digits) (err = 0.0000) (time = 1:04:58) 11:59:01
Testing 1880370^524288+1...
Using OCL2 transform
Starting initialization...
Initialization complete (2.066 seconds).
Estimated time for 1880370^524288+1 is 1:03:00
1880370^524288+1 is an Euler probable prime to base 19. (3289511 digits) (err = 0.0000) (time = 1:03:55) 13:02:56
Testing 1880370^524288+1...
Using OCL2 transform
Starting initialization...
Initialization complete (2.036 seconds).
Estimated time for 1880370^524288+1 is 1:03:00
1880370^524288+1 is prime (21 is a primitive root). (3289511 digits) (err = 0.0000) (time = 1:04:01) 14:06:57
Then the shortest primality proof is "21 is a primitive root" and until the fix is released ocl2 must be used for the primality test.



Michael GoetzVolunteer moderator Project administrator
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And it looks like we've got 201 as well, and it's another big one. We still have to verify it, of course, but it's not likely to be an error. Scott has found a GCW. Yup, same Scott. It's a really good week to be Scott!
In other news, the GFN17mega has been reported:
48370248^131072+1
____________
My lucky number is 75898^{524288}+1 


pschoeferVolunteer developer Volunteer tester
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And it looks like we've got 201 as well, and it's another big one. We still have to verify it, of course, but it's not likely to be an error. Scott has found a GCW. Yup, same Scott. It's a really good week to be Scott!
Amazing!
One month later, either of those primes would likely have won him the red and green jersey. And guess which projects I was planning to run next month, because I had the feeling that a prime is overdue... ;)
____________



Michael GoetzVolunteer moderator Project administrator
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And it looks like we've got 201 as well, and it's another big one. We still have to verify it, of course, but it's not likely to be an error. Scott has found a GCW. Yup, same Scott. It's a really good week to be Scott!
Amazing!
One month later, either of those primes would likely have won him the red and green jersey. And guess which projects I was planning to run next month, because I had the feeling that a prime is overdue... ;)
He still gets a billiard ball. :)
____________
My lucky number is 75898^{524288}+1 


Michael GoetzVolunteer moderator Project administrator
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Here's the information on the GC:
1323365*116^1323365+1
Congratulations again Scott! And leave some for the rest of us! :)
By the way, the GFN 19 is 3,289,511 digits, the GFN 17 is 1,007,234 digits, and this GC is 2,732,038 digits.
It's the first known base 116 Generalized Cullen prime. Congrats Scott Brown!
It's our 5th mega prime of the year, and oddly enough the first one that isn't a GFN.
____________
My lucky number is 75898^{524288}+1 



Wow a huge Congrats! Well done.
Cheers 



And it looks like we've got 201 as well, and it's another big one. We still have to verify it, of course, but it's not likely to be an error. Scott has found a GCW. Yup, same Scott. It's a really good week to be Scott!
Amazing!
One month later, either of those primes would likely have won him the red and green jersey. And guess which projects I was planning to run next month, because I had the feeling that a prime is overdue... ;)
He still gets a billiard ball. :)
I didn't think billiard balls went all the way up to 116. Have I been playing wrong?
And... wow. That's insane, getting those two that close together. Nice work. 



He still gets a billiard ball. :)
He's going to end up taking up half a page for every post. Might want to look into adding a little scroll bar for the user info box. 



31Oct2017: 188 Mega Prime: GFN18 : 3547726^262144 + 1
03Nov2017: 189 Mega Prime: PPSMega: 943 * 2^3440196 + 1
13Nov2017: 190 Mega Prime: PPSMega: 943 *2^3442990 + 1
16Nov2017: 191 Mega Prime: GFN18 : 3596074^262144 + 1
28Nov2017: 192 Mega Prime: PPSMega: 1155*2^3446253 + 1
03Dec2017: 193 Mega Prime: GFN18 : 3673932^262144 + 1
04Dec2017: 194 Mega Prime: PPSMega: 1065* 2^3447906 + 1
13Dec2017: 195 Mega Prime: TRP : 273809*2^8932416  1
28Dec2017: 196 Mega Prime: PPSMega: 1155*2^3455254 + 1

08Jan2018: 197 Mega Prime: GFN17 : 48273828^131072 + 1
10Jan2018: 198 Mega Prime: GFN18 : 3853792^262144 + 1
15Jan2018: 199 Mega Prime: GFN19 : 1880370^524288 + 1
18Jan2018: 200 Mega Prime: GFN17 : 48370248^131072+1
Maybe it's time to start a 2018 MP thread HERE
____________
Badge Score: 1*2 + 7*5 + 7*6 + 3*7 + 2*8 + 1*9 = 125 


dukebgVolunteer tester
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Here's the information on the GC:
1323365*116^1323365+1
Congratulations again Scott! And leave some for the rest of us! :)
By the way, the GFN 19 is 3,289,511 digits, the GFN 17 is 1,007,234 digits, and this GC is 2,732,038 digits.
It's the first known base 116 Generalized Cullen prime. Congrats Scott Brown!
It's our 5th mega prime of the year, and oddly enough the first one that isn't a GFN.
So is taken, 116 will be removed from the sieve and LLR candidates higher than that are removed from DB (letting the tasks for the lower ones complete), correct?
(I assume, all of this is also waiting for the T5K confirmation)
Also, congrats, Scott! Wow... 


JimBHonorary cruncher Send message
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So is taken, 116 will be removed from the sieve and LLR candidates higher than that are removed from DB (letting the tasks for the lower ones complete), correct?
(I assume, all of this is also waiting for the T5K confirmation)
Also, congrats, Scott! Wow...
116 was removed from the sieve and generation of LLR candidates with base 116 ceased as soon as we saw the result from Scott showing the prime. Any workunits already out there will complete as normal. You can see on the GCW LLR stats that there are no GC116 jobs waiting and on the GCW Sieving stats that base 116 is no longer showing. Had that candidate not actually been prime, it would have taken about 30 seconds to turn b=116 on again. 

