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 2020-07-13, 22:48 #210 carpetpool     "Sam" Nov 2016 2×163 Posts Another lucky hit: 26*3^1700041+1 may be prime, but N divides 3^((N-1)/3))-1, restarting with a=5 Time : 938.494 sec. 26*3^1700041+1 is prime! (811128 decimal digits) Time : 946.942 sec.
 2020-08-01, 17:44 #211 rudy235     Jun 2015 Vallejo, CA/. 3CA16 Posts Largest prime for 2020 (till now) TO BE VERIFIED Congratulations to Serge Batalov. Gaussian Mersenne. #20 on the current list. 215317227 + 27658614 + 1 4,610,945 digits.
2020-08-01, 20:16   #212
pepi37

Dec 2011
After milion nines:)

2·5·139 Posts

Quote:
 Originally Posted by rudy235 TO BE VERIFIED Congratulations to Serge Batalov. Gaussian Mersenne. #20 on the current list. 215317227 + 27658614 + 1 4,610,945 digits.

Serge never publish prime until he is 101% sure it is prime :)

2020-08-02, 17:36   #213
rudy235

Jun 2015
Vallejo, CA/.

2×5×97 Posts

Quote:
 Originally Posted by pepi37 Serge never publish prime until he is 101% sure it is prime :)
Well, 101 happens to be prime.

 2020-10-30, 22:13 #214 paulunderwood     Sep 2002 Database er0rr 3,533 Posts Congrats to Scott Brown for the "321+" prime, 3*2^16408818+1, which was 6.5 years in the making by PrimeGrid.
 2020-11-17, 21:06 #215 kar_bon     Mar 2006 Germany 2·1,433 Posts Seems a new prime for the Riesel Problem was found: 146561*2^11280802-1 found by PrimeGrid's project currently in verify status. This is, when proven, almost 3 years after the last found for this problem.
 2020-12-01, 17:46 #216 paulunderwood     Sep 2002 Database er0rr 3,533 Posts "P587124" Congrats to a1call for this top5000 prime of a most unusual construction.
2020-12-01, 19:05   #217
sweety439

Nov 2016

53148 Posts

Quote:
 Originally Posted by kar_bon Seems a new prime for the Riesel Problem was found: 146561*2^11280802-1 found by PrimeGrid's project currently in verify status. This is, when proven, almost 3 years after the last found for this problem.
this number is now proven to be prime, now there are 47 Riesel base 2 candidate left.

2020-12-01, 23:49   #218
kar_bon

Mar 2006
Germany

1011001100102 Posts

Quote:
 Originally Posted by sweety439 this number is now proven to be prime, now there are 47 Riesel base 2 candidate left.
No, that page was already updated: there're still 48 k-values left.

 2020-12-11, 23:32 #219 pepi37     Dec 2011 After milion nines:) 2·5·139 Posts New 1.43M repdigit prime will appear soon :) It was time to find something bigger after 5 years searching in this sequence :)
 2020-12-11, 23:43 #220 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 220568 Posts Good! Congratulations!

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