[quote=Cruelty;134167]4*3^350767-1 (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*3^353635-1 (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*2^1684813-1[/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*2^1253870-1 (377454 digits)

Congrats to Frank (L65)!