mersenneforum.org

mersenneforum.org (https://www.mersenneforum.org/index.php)
-   Conjectures 'R Us (https://www.mersenneforum.org/forumdisplay.php?f=81)
-   -   Base 13 prime found (https://www.mersenneforum.org/showthread.php?t=12536)

Siemelink 2009-10-05 18:27

Base 13 prime found
 
Hi everyone,

one of my side projects has given me a large prime. I had noticed that there was no prime with base 13 in the top 5000. So I found one:

Primality testing 6710*13^142143-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
6710*13^142143-1 is prime! (10738.7531s+0.0591s)

Other bases that need the same treatment:
base 7, 11 have +1 but no -1
base 13 has -1 but no +1
Base 14 has no entries.

Cheers, Willem.
--
PS what would be the most fitting subforum? I decided on CRUS because this is where i hang out.


All times are UTC. The time now is 01:01.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.