Another lucky hit:
26*3^1700041+1 may be prime, but N divides 3^((N1)/3))1, restarting with a=5 Time : 938.494 sec. 26*3^1700041+1 is prime! (811128 decimal digits) Time : 946.942 sec. 
Largest prime for 2020 (till now)
TO BE VERIFIED
Congratulations to Serge Batalov. Gaussian Mersenne. #20 on the current list. 2[SUP]15317227[/SUP] + 2[SUP]7658614[/SUP] + 1 4,610,945 digits. 
[QUOTE=rudy235;552206]TO BE VERIFIED
Congratulations to Serge Batalov. Gaussian Mersenne. #20 on the current list. 2[SUP]15317227[/SUP] + 2[SUP]7658614[/SUP] + 1 4,610,945 digits.[/QUOTE] Serge never publish prime until he is 101% sure it is prime :) 
[QUOTE=pepi37;552218]Serge never publish prime until he is 101% sure it is prime :)[/QUOTE]
Well, 101 happens to be prime. 
Congrats to Scott Brown for the "321+" prime, [URL="https://primes.utm.edu/primes/page.php?id=131362"]3*2^16408818+1[/URL], which was 6.5 years in the making by PrimeGrid.
:banana: 
Seems a new prime for the [url='https://www.rieselprime.de/ziki/Riesel_problem']Riesel Problem[/url] was found: [url='https://primes.utm.edu/primes/page.php?id=131405']146561*2^112808021[/url] found by PrimeGrid's project currently in verify status.
This is, when proven, almost 3 years after the last found for this problem. 
"P587124"
Congrats to a1call for [URL="https://primes.utm.edu/primes/page.php?id=131431"]this top5000 prime[/URL] of a most unusual construction.
:banana: 
[QUOTE=kar_bon;563554]Seems a new prime for the [url='https://www.rieselprime.de/ziki/Riesel_problem']Riesel Problem[/url] was found: [url='https://primes.utm.edu/primes/page.php?id=131405']146561*2^112808021[/url] found by PrimeGrid's project currently in verify status.
This is, when proven, almost 3 years after the last found for this problem.[/QUOTE] this number is now proven to be prime, now there are 47 Riesel base 2 candidate left. 
[QUOTE=sweety439;564956]this number is now proven to be prime, now there are 47 Riesel base 2 candidate left.[/QUOTE]
No, that page was already updated: there're still 48 kvalues left. 
New 1.43M repdigit prime will appear soon :)
It was time to find something bigger after 5 years searching in this sequence :) 
Good! Congratulations!

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