Riesel Primes k*2^n-1, k<300 [Was "k=1"]

[Kosmaj]

I'd like to reserve k=35 from 210k.

Progress of my other k's:
k=13, checked to 945000
k=21, to 553000
k=77, to 310000

[Templus]

Unfortunately there were no new primes found for k=241.

k=241 checked to 200000 , no new primes found

reserving k=235 to 150000 , so someone else can test 150000 - 200000 to minimize the efforts and time.

[jocelynl]

Only one to go!
Shall we turn off the lights?
253 is almost done to 1000000 so I'm taking 191 also to 1000000
I'll make the sieve file from 1-10M available then.

Joss

[Harvey563]

k=185 is checked from 128100 to 200000, & is only prime for 133346.

Harvey563

[Templus]

k=235 is checked to n=150000 and is prime for 136767

so: 235*2^136767 = prime! 41174 digits

Checking k=235 from n=150000 to n=200000

[Harvey563]

I have checked 31*2^n-1 to 500000 and found the following primes: 1, 5, 7, 11, 13, 23, 33, 35, 37, 47, 115, 205, 235, 271, 409, 739, 837, 887, 2189, 3465, 4653, 5073, 8011, 8061, 21957, 24589, 25657, 44653, 50321, 57647, 62083, 78179, 80021, 81655, 111667, 150265, 177089, 196433, 274115, 306751, 311389, 315523. I quitting, so k=31 is up for grabs.

I have also checked k= 279 from 130000 to 135000, 145000 to 155000, & 165000 to 185000 with no primes found.

Harvey563

[Templus]

k=235 is now checked until n=180k and no new primes were found.
I expect to finish the range by monday.

Templus

[Templus]

I was a little too quick with making my previous post, in fact I indeed found a prime until n=180k:

235*2^178739-1 = prime!

[Kosmaj]

Templus congrats! This prime is large enough to report to the Top-5000 list of primes. Please check http://primes.utm.edu for details. The procedure is described here. First create a new prover account for yourself, giving your real name and your mail address. Then you should create a new proof-code listing yourself, LLR, and the sieving software you used (NewPGen ?). After that you can submit the prime using the created proof-code. If you have any questions please mail me either at Yahoo, or using the forum private mail.

By the way,
35*2^246732-1 is prime,
k=35 checked to n=250000, further tests in progress.

[Templus]

k=235 is finished until n=200000 ! and my new prime number is....:

235*2^191973-1 is prime

I also posted this prime to the top5000 primelist.

I'm going to work further on k=235, I already made a sievefile until n=400000

[Thomas11]

k=11 is tested up to n=700000 [continuing]
k=29 is tested up to n=1000000 [continuing]

And the big surprise: 11*2^696438-1 is prime!



-- Thomas11 L10