[quote=Cruelty;134167]4*3^3507671 (167359 digits)[/quote]
You stall the server for 13.86 hours!!! lol Congratulations. 
Verification took me 32200 seconds on a 3GHz Core2 :smile:

Another k=4, b=3 prime
4*3^3536351 (168728 digits)

Congrats on yet another one, very close to the one you reported a week ago.
:shock::smile: 
Thanks! It's time for k=2 prime :wink:

Benson prime:
[url=http://primes.utm.edu/primes/page.php?id=85095]19*2^16848131[/url] 
[URL="http://primes.utm.edu/primes/page.php?id=85126"]Another one from Curtis Cooper[/URL] :tu:

Twin Prime
108615*2^110342+1 is twin prime!
Comes in at 7th place :smile: 
Congrats on a nice twin!
If it's not a secret how many n's did you check? I suppose you used the approach recently suggested by Robert Smith (?) Or, how many LLR tests in total? Thanks. 
[quote=Kosmaj;135790]Congrats on a nice twin!
If it's not a secret how many n's did you check? I suppose you used the approach recently suggested by Robert Smith (?) Or, how many LLR tests in total? Thanks.[/quote] Thanks Kosmaj. Well, I'm not sure how much to give away because I intend to search higher and I don't know how much was pure luck and how much was technique. I suspect a large amount of luck because it was found after just 220,000 candidates and 164 Riesel primes. (Just 10 days on all 4 cores at 3.18GHz, including sieving.) It's a refinement of this idea: [URL]http://mersenneforum.org/showpost.php?p=117068&postcount=6[/URL] I'm now searching for the No.1 twin until I find one or get bored. Probably the latter. Chris 
A new k=27 prime by 12121:
27*2^12538701 (377454 digits) Congrats to Frank (L65)! 
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