primesearch

[masser]

Hi all,

Does anyone here contribute to the primesearch project located at:

www.mycgiserver.com/~primesearch/

We (the 15k group) completed the k<250, n<200000 search earlier this summer with amazing speed and relatively few errors, in my opinion. Since then, it seems like the 15k project has lost any focus it had. What are we doing now?

Until two weeks ago, I was considering proposing that we help primesearch complete the k<1000, n<200000 search. However, their webpage has been unusable the last week or so and I tried contacting their admin but got no response.

Is anyone here capable of logging into their webpage and reserving ranges?

If the primesearch webpage becomes operable again, would anyone be interested in completing all of the ranges with n<200000? I bet we could do it before the end of the year.

best regards,
Tom

[Gipe]

Originally Posted by masser

Hi all,

Does anyone here contribute to the primesearch project located at:

www.mycgiserver.com/~primesearch/

We (the 15k group) completed the k<250, n<200000 search earlier this summer with amazing speed and relatively few errors, in my opinion. Since then, it seems like the 15k project has lost any focus it had. What are we doing now?

Until two weeks ago, I was considering proposing that we help primesearch complete the k<1000, n<200000 search. However, their webpage has been unusable the last week or so and I tried contacting their admin but got no response.

Is anyone here capable of logging into their webpage and reserving ranges?

If the primesearch webpage becomes operable again, would anyone be interested in completing all of the ranges with n<200000? I bet we could do it before the end of the year.

best regards,
Tom

Well.....no luck from here and not for a long time...
I have been able to log in there but not to be able to submit my results

[Harvey563]

I've been unable to login for the last two weeks. I just posted to the yahoo primenumber list about it. I've sent emails to the webmaster, but get no replies.
It's often taken me several retries in the past, especially to post results; but now it seems totally down.

Harvey563

[Harvey563]

For what it's worth, I can tell you all that I am intending to check the ranges
451, 453, 455; and 469, 471, 473, 475, 477, 479, 481, 483, 485, 487, &489 from 190000 to 230000 in the near future. So if anyone has already checked any of them, I'd appreciate a heads up.
Dale Andrews maintains a list of Riesel ranges with k values from 300 to 1000 at http://www.geocities.com/primes_r_us/riesel/index.html
I keep a list of Riesel ranges that I have checked at http://www.geocities.com/harvey563/reisels.txt

Harvey563

[jocelynl]

We (the 15k group) completed the k<250, n<200000 search earlier this summer with amazing speed and relatively few errors, in my opinion. Since then, it seems like the 15k project has lost any focus it had. What are we doing now?

The last few bugs in LLR scarred people in doing work for nothing. I, for myself, am waiting to see how the last version goes. For the time being, I concentrate my effort at factoring with various methods P-1, ECM, SIQS, NFS. I still manage the stats for thoses interested.

Joss

[masser]

Originally Posted by Harvey563

Dale Andrews maintains a list of Riesel ranges with k values from 300 to 1000 at http://www.geocities.com/primes_r_us/riesel/index.html
I keep a list of Riesel ranges that I have checked at http://www.geocities.com/harvey563/reisels.txt

Harvey563

Thanks for the link. I'm going to send my results to Dale Andrews' site and post any ranges I plan on searching here in the forum.

Right now, I'm working on ranges for

k=555, 639, 903, 933 and 975; testing all of them to n=200000.

regards,
Tom

[masser]

The primesearch webpage appears to be operational again.

The results submission is still a little buggy. I had to expire a lot of the ranges that I have not yet completed before I could submit the results for my completed ranges.

Regards,
Tom

[Jean Penné]

Hi All,

While testing the last LLR version on the whole
PrimeSearch project database (downloaded the 12/02/05), I found
14 numbers which are composite, while registered as
prime(I confirmed these results with Proth 7.0).
In order to help to correct the database, I have
redone the 14 ranges containing an error, thinking that
the senders had really found primes, but made typos...
In fact, I found 13 primes which are certainly the true
ones, and which, all but two, seem to be typos (one
false digit, or two permuted digits in exponent...).
Only one problem was then remaining :
For k=825, I found no primes in the range n=120000 to 130000,
so, I contacted Footmaster, the sender of the false prime
825*2^129236-1, who gave me the solution :
the very prime is 825*2^129236+1 so, out of this topic!

I sent these results to Michael Hartley, but he told me that
he has difficulties to insert the corrections in the database,

So, I will now send you below my completed results :

1) k = 261, n = 90000 to 100000, 1 prime found.
261*2^90861-1 is prime! (instead of 261*2^90763-1).
2) k = 291, n = 70000 to 80000, 1 prime found.
291*2^72513-1 is prime! (instead of 291*2^77513-1).
3) k = 453, n = 175000 to 180000, 1 prime found.
453*2^176860-1 is prime! (instead of 453*2^176727-1).
4) k = 495, n = 48000 to 60000, 1 prime found.
495*2^50833-1 is prime! (instead of 495*2^50883-1).
5) k = 609, n = 48000 to 60000, 2 primes found.
609*2^55307-1 is prime! O.K.
609*2^57769-1 is prime! (instead of 609*2^57709-1).
6) k = 635, n = 130000 to 135000, 1 prime found.
635*2^132548-1 is prime! (instead of 635*2^132162-1 ).
7) k = 651, n = 16000 to 32000, 6 primes found.
651*2^16042-1 is prime! O.K.
651*2^17453-1 is prime! O.K.
651*2^19181-1 is prime! O.K.
651*2^21922-1 is prime! O.K.
651*2^24025-1 is prime! (instead of 651*2^24035-1).
651*2^26441-1 is prime! O.K.
8) k = 665, n = 32000 to 48000, 5 primes found.
665*2^34842-1 is prime! O.K.
665*2^35792-1 is prime! O.K.
665*2^39464-1 is prime! O.K.
665*2^40498-1 is prime! (instead of 665*2^40408-1).
665*2^40840-1 is prime! O.K.
9) k = 711, n = 215000 to 220000, 1 prime found.
711*2^215681-1 is prime! (instead of 711*2^215861-1 ).
10) k = 735, n = 160000 to 165000, 1 prime found.
735*2^163139-1 is prime! (instead of 735*2^163169-1).
11) k = 825, n = 120000 to 130000, no primes found (instead of 1).
825*2^129236-1 is composite, but 825*2^129236+1 is prime!
12) k = 873, n = 32000 to 48000, 3 primes found.
873*2^35486-1 is prime! O.K.
873*2^37832-1 is prime! O.K.
873*2^44251-1 is prime! (instead of 873*2^44250-1).
13) k = 945, n = 16000 to 32000, 4 primes found.
945*2^21200-1 is prime! O.K.
945*2^24830-1 is prime! O.K.
945*2^28922-1 is prime! O.K.
945*2^31062-1 is prime! (instead of 945*2^21062-1).
14) k = 959, n = 16000 to 32000, 2 primes found.
959*2^16220-1 is prime! O.K.
959*2^26428-1 is prime! (instead of 959*2^26248-1).

Perhaps Michael Hartley will later insert these results in his
errata page.

Best Regards,

Jean