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-   -   Riesel Primes k*2^n-1, k<300 [Was "k=1"] (https://www.mersenneforum.org/showthread.php?t=1767)

masser 2004-07-08 15:34

k=183 complete up to n=200000
 
Hi all,

Here are the results for k=183:

k=183: n=4, 11, 22, 31, 52, 56, 59, 67, 88, 104, 251, 572, 724, 1379, 2696, 3616, 3928, 8518, 9239, 9419, 10547, 20396, 42136, 43936, 69422.


Best regards,
masser

Harvey563 2004-07-08 16:17

k=33 complete up to 20000
 
I checked k=33 from 43200 to 200000 and found the following primes: 51326, 57695, 63115, 67182, 109848, 128635, 136971, 173110, & 174182.
I am reserving k=167 to 200000.

Harvey563
:lol:

Harvey563 2004-07-08 22:52

k=25, 300k to 400k
 
I picking up k=25 from 300000 to 400000. If anyone else has already done it, or really wants it, please let me know.

Harvey563
:rolleyes:

Templus 2004-07-10 13:50

Testing k=177 for 70.000 < n < 80000

jocelynl 2004-07-11 13:51

k=177 is now reserved to you
Release it whenever you're done.

Joss

Thomas11 2004-07-12 12:42

k=95 and 99 done to n=200000
 
Here comes a little status report:

k=95 and k=99 are tested up to n=200000 (I'm stopping there).

k=95 is prime for n=140840
k=99 is prime for n=118711, 170867, 175921

k=113 is done to n=500000 (stopping)
k=29 is done to n=825000 (continuing)

-- Thomas11

Harvey563 2004-07-12 17:30

K=115 complete to 200000, k=229 reserved to 200000
 
I checked 115 from 70400 to 200000 & only found primes: 87151 & 98543.
I just found 27*2^444622-1 prime though! k=27 is checked to 449765 & I'm continuing to 500000.
I'm reserving k=229 to 200000.

Harvey563
:showoff:

masser 2004-07-12 21:13

k=225 complete to n=200000.
 
Hi all,

Here are the results for k=225.

k=225; n=1, 23, 25, 53, 65, 139, 149, 481, 613, 1343, 1601, 2125, 4385, 9005, 9169, 57013, 99821, 113893, 162653.

Best regards,
Masser :smile:

Kosmaj 2004-07-13 09:07

My Status Report
 
k=7, checked all n<920000 and some higher n's.
850k-1M sieved to 6.26 trillion.
Continuing and hoping to reach 1M by the end of July.
Currently sieving 1-1.3M, may extend to 1.5M.
Last prime for n=372897 found by me in early May.

k=13, checked all n<810000 and some higher n's.
800k-1M sieved to 6.65 trillion.
Continuing and hoping to reach 1M sometime in August.
Last prime for n=233207 found by g267 last year.

NO PRIMES [yet] ... :sad: but I'm not giving up! :cool:

k=53, 79 and 89. all checked to n=290000. Continuing all three.

Templus 2004-07-13 22:28

Status report on k=177
 
I was really hoping to find at least one prime in the range of 70k < n < 100k and guess what??

I found one!! :grin:

177*2^96978 - 1 is prime! (P = 1, Q = -1) [29196 digits] :showoff:
so for k =177, n = 96978 is another prime.

Continue to work on k = 177

Alright, it isn't a world record, but it's my first prime I ever found!

jocelynl 2004-07-14 00:01

Templus,

Congratulation on your first prime! There are many more out there waiting to be found.

[Quote]177*2^96978 - 1 is prime! (P = 1, Q = -1) [29196 digits] [/QUOTE]
What program are you using? It seems with (P and Q) you're not using the fastest software out there. I recommend you use LLR it can be found at [URL=http://www.15k.org]15k.org[/URL] It is by far the fastest out there for k*2^n-1

Joss


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