20210211, 06:55  #1959 
"Alexander"
Nov 2008
The Alamo City
2·3^{3}·17 Posts 
That range was already tested by Kosmaj. Luckily I found it on PrimePages. It's 55*2^20843051.
Last fiddled with by Happy5214 on 20210211 at 06:55 Reason: Linking to PrimePages 
20210306, 09:13  #1960 
Mar 2007
Estonia
149 Posts 
Code:
195*2^46857111 is prime! (1410542 decimal digits) k<300 highest Nash weight k delivers again. 
20210306, 19:32  #1961  
Dec 2011
After milion nines:)
3·541 Posts 
Quote:
Congratulations! 

20210318, 08:38  #1962 
"Gary"
May 2007
Overland Park, KS
2E21_{16} Posts 
285*2^18012361 is prime

20210405, 17:41  #1963 
"Curtis"
Feb 2005
Riverside, CA
3·1,877 Posts 
Been a while:
99*2^26584961 is prime! (800290 digits) 
20210412, 05:34  #1964 
"Gary"
May 2007
Overland Park, KS
7^{2}·241 Posts 
From the 3rd megabit drive:
257*2^21085541 is prime :) 
20210426, 16:40  #1965 
"Gary"
May 2007
Overland Park, KS
7^{2}×241 Posts 
A pair from the 3rd megabit drive:
235*2^21632731 219*2^21786731 
20210429, 20:22  #1966 
Mar 2007
Estonia
149 Posts 
Code:
197*2^47653181 is prime! (1434506 decimal digits) https://primes.utm.edu/primes/page.php?id=132236 
20210627, 11:11  #1967 
"Gary"
May 2007
Overland Park, KS
7^{2}·241 Posts 
21*2^29597891 is prime

20210907, 18:27  #1968 
Jun 2015
Vallejo, CA/.
3·383 Posts 
The largest prime for 2021 and 2nd largest since Christmas 2018 has been discovered.
It is a 3 2 1 Prime i.e. 3*2^{k}1 The prime is 3*2^{17748034 } 1 and has 5342692 digits. This is the largest known prime for the 3*2^n1 form. Currently it stands in position 18 overall and is the 6^{th} NonMersenne prime in size. Congratulations to Mark Wiseler and the PrimeGrid group. Last fiddled with by VBCurtis on 20210908 at 00:01 Reason: Fixed the "+1" to be the correct 1 
20210907, 21:48  #1969  
Jan 2021
California
1005_{8} Posts 
Quote:
Edit: I can see that it's almost certainly the 1 form from the next line in the post, but it's still confusing with the first line contradicting it. VBCurtis: I fixed the post. Last fiddled with by VBCurtis on 20210908 at 00:01 

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