20220219, 12:15  #23 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
2^{3}×641 Posts 
Congratulations Dr. Ryan.

20220616, 13:02  #24 
Mar 2006
Germany
3^{4}×37 Posts 
One down for the Rieselbase 5 conjecture:
64598 * 5^37698541 is prime, 2,635,020 digits, found on 20220614 by PrimeGrid. Curious: the 5 digits of the kvalue appear also in the nvalue. Awaiting official announcement, still some tasks open for this k. 
20220617, 03:40  #25  
Jun 2015
Vallejo, CA/.
1146_{10} Posts 
Quote:
Congratulations! This is the 97th prime with between 2 million and 3 million digits. There are 10 primes in total (in that range) of the form k* 5^n +/ 1. (8 with 1 and 2 with +1) 

20220620, 10:05  #26  
"Gary"
May 2007
Overland Park, KS
2·3^{2}·5·131 Posts 
Quote:


20220620, 21:59  #27 
Dec 2011
After milion nines:)
3·541 Posts 
And there is new one :)
https://primes.utm.edu/primes/page.php?id=134068 63838 *5^38878511 2717497 digits, current 99 rank 
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