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2008-01-14, 05:28   #144
gd_barnes

May 2007
Kansas; USA

2×71×73 Posts

Quote:
 Originally Posted by tcadigan I'll take the files: sieve-sierp-base16-10183.txt sieve-sierp-base16-10947.txt
You got 'em. I'll show them as reserved to n=100K. Note that they have been searched to n=30K even though the sieved files start at n=25K so you can delete the n's below 30K.

Gary

 2008-01-14, 05:57 #145 gd_barnes     May 2007 Kansas; USA 2·71·73 Posts Riesel base 16: k=1478 and 3620 are complete to n=100K which include double-checks to n=65K and 75K respectively. No primes. I'm unreserving them. Curtis's k=443 has completed a double-check to n=65K. Gary Last fiddled with by gd_barnes on 2008-01-14 at 05:58
2008-01-14, 06:45   #146

Sep 2004
UVic

2×5×7 Posts
10947 prime found

Quote:
 Originally Posted by gd_barnes You got 'em. I'll show them as reserved to n=100K. Note that they have been searched to n=30K even though the sieved files start at n=25K so you can delete the n's below 30K. Gary
10947*2^142748+1 is prime! Time: 30.257 sec.

aka 10947*16^35687+1

results file attached.

taking sieve-sierp-base16-12243.txt
continuing with other reservation
Attached Files
 lresults.txt (26.0 KB, 77 views)

2008-01-14, 08:46   #147
gd_barnes

May 2007
Kansas; USA

2×71×73 Posts

Quote:
 Originally Posted by geoff Testing is at n=8K, there are 95 candidate k left.

Geoff,

I am done with analysis on most bases for k's that are multiples of the base (MOB). We are now going to include all k's that are MOB that yield a different prime for n>=1 then k / b but we will be excluding GFN's from all consideration. For Sierp base 6, the following situations exist:

k=1296, 7776, and 46656 are GFn's without a prime and are eliminated from consideration.

k=90546 is the only k remaining at n=10K that I found that does not have a prime but whose prime will be different than k / b = 90546 / 6 = 15091. That is 15091*6^1+1 is prime.

I am assuming your total of 95 k's remaining excluded k's that are multiples of the base. So on the web pages that will be updated shortly, you'll see 96 k's remaining at n=8K.

If you could, please add k=90546 to your testing starting at n=10K. Alternatively, I can just put it on the reservation page for people to pick up at a later time.

Thanks,
Gary

2008-01-14, 08:55   #148
gd_barnes

May 2007
Kansas; USA

2×71×73 Posts

Quote:
 Originally Posted by michaf Another one down for riesel 31: 30792*31^28604-1 is prime That leaves another 14 k’s to test.
Michaf,

Keep those primes coming!

I just wanted to give you a heads up here. Beginning on Monday, the project will be including k's that are a multiple of the base (MOB) but where the k yields a different prime for n>=1 than k / b -but- it will be excluding Generalized Fermat #'s (GFn's) from all consideration.

I am doing analysis on all bases for these issues but there are a few more difficult ones that I wasn't able to do yet. Base 31 is one of them. The web pages are being updated right now.

If you would like to do some analysis on base 31 for this issue, let me know. I have found the impact to be minimal for most bases. As an example, for Sierp base 6 with a conjecture of k=174308, there were 3 GFn's without a prime that were eliminated and only ONE k remaining without a prime at n=10K that was a MOB and will yield a different prime than k / b.

I can take care of this but if you'd like to try it, that works for me. If there are any questions, let me know.

Thanks,
Gary

Last fiddled with by gd_barnes on 2008-01-14 at 09:04

2008-01-14, 09:36   #149
gd_barnes

May 2007
Kansas; USA

1036610 Posts

Quote:
 Originally Posted by michaf One for Riesel 31: Several for Sierpinski 24:
Michaf,

I've done analysis on Sierp base 24 for k's that are multiples of the base. The only one that needs a prime is k=17496. I tested it up to n=6.5K and changed the # of k's remaining from 172 to 173.

Can you test it starting from n=6.5K? If not, I can put it up for reservation.

Thanks,
Gary

2008-01-14, 20:43   #150
michaf

Jan 2005

479 Posts

If you meant all the 0 mod 31's that I left out:
It was a massive amountof 2 numbers:
28458 --> 918
69998 --> 2258

918*31^17504-1 is prime, so 2848*31^17503-1 is prime too.

What baffles me, is that I have no record of a prime for 2258

duh...just noticed that 2258*31^1-1 is prime :>
which was the problem in the first place.

So this amounts to one problematic number, I will incorporate it in my search,

Quote:
 Originally Posted by gd_barnes Michaf, Keep those primes coming! I just wanted to give you a heads up here. Beginning on Monday, the project will be including k's that are a multiple of the base (MOB) but where the k yields a different prime for n>=1 than k / b -but- it will be excluding Generalized Fermat #'s (GFn's) from all consideration. I am doing analysis on all bases for these issues but there are a few more difficult ones that I wasn't able to do yet. Base 31 is one of them. The web pages are being updated right now. If you would like to do some analysis on base 31 for this issue, let me know. I have found the impact to be minimal for most bases. As an example, for Sierp base 6 with a conjecture of k=174308, there were 3 GFn's without a prime that were eliminated and only ONE k remaining without a prime at n=10K that was a MOB and will yield a different prime than k / b. I can take care of this but if you'd like to try it, that works for me. If there are any questions, let me know. Thanks, Gary

2008-01-14, 22:17   #151
gd_barnes

May 2007
Kansas; USA

2×71×73 Posts

Quote:
 Originally Posted by michaf If you meant all the 0 mod 31's that I left out: It was a massive amountof 2 numbers: 28458 --> 918 69998 --> 2258 918*31^17504-1 is prime, so 2848*31^17503-1 is prime too. What baffles me, is that I have no record of a prime for 2258 I also have not found it in 1mod2, 1mod3 or 1mod5. duh...just noticed that 2258*31^1-1 is prime :> which was the problem in the first place. So this amounts to one problematic number, I will incorporate it in my search,

Great! Yes, the n=1 primes are the potential problems for k * b (as well as n=2/n=3/other low primes for k * b^q).

I'll add k=69998 to the pages for Riesel base 31. Since k=2258 was eliminated immediately, I'll show k=69998 reserved by you and tested to n=0K.

Thanks for taking care of that!

Gary

2008-01-15, 00:40   #152

Sep 2004
UVic

2·5·7 Posts
12243 prime found

12243*2^198772+1 is prime! Time: 53.926 sec.

aka 12243*16^49693+1

results file attached.
Attached Files
 lresults.txt (108.9 KB, 74 views)

2008-01-15, 00:42   #153

Sep 2004
UVic

2·5·7 Posts

completed reservation for 10183

no prime

results file attached.

taking:
sieve-sierp-base16-13438.txt
sieve-sierp-base16-14910.txt
Attached Files
 lresults.txt (47.3 KB, 77 views)

Last fiddled with by tcadigan on 2008-01-15 at 00:46

2008-01-15, 02:34   #154
geoff

Mar 2003
New Zealand

100100001012 Posts
Sierpinski base 6 status

Quote:
 Originally Posted by gd_barnes I am assuming your total of 95 k's remaining excluded k's that are multiples of the base. So on the web pages that will be updated shortly, you'll see 96 k's remaining at n=8K. If you could, please add k=90546 to your testing starting at n=10K. Alternatively, I can just put it on the reservation page for people to pick up at a later time.
Actually the 95 k remaining at n=8K includes multiples of 6. I only removed perfect powers of 6 from the original sieve.

Now 60k remain at n=25K. I should be finished to n=30K by the 17th Jan.

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