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-   -   Bases 2 & 4 reservations/statuses/primes (https://www.mersenneforum.org/showthread.php?t=9830)

 gd_barnes 2008-01-24 18:15

[quote=jasong;122939]If no one objects, I'd like to reserve 16734*4^n-1. That's base=4, k=16734, Riesel numbers(-1). I believe the n-values that need to be tested start at n=100K.

If there's a sieved file, I'd love to know about it. Also, if people would rather I sieve than LLR, I can do that to. I just ask that the digit length of the lowest untested value in the sieve file be no more than twice the digit length of any un-LLred value in a lower base. In that instance, I'd probably want to sieve a lower base.[/quote]

Jasong is unreserving Riesel base 4 k=16734. He is working on another unrelated effort.

This also unreserves Riesel base 2 odd-n k=8367 and Riesel base 16 k=16734.

Gary

 gd_barnes 2008-01-24 18:17

Jasong has unreserved Riesel base 4 k=16734 per a post that I just now put in the reservations/statuses thread.

This also unreserves Riesel base 16 k=16734 and the Riesel base 2 odd-n conjecture of k=8367.

I have changed the above post accordingly.

Gary

 Jean Penné 2008-01-24 20:12

Unreserving k=19464

1 Attachment(s)
[QUOTE=gd_barnes;123772]Karsten and Jean,

There are 3 more k's for Riesel base 2 ODD-n, base 4, and base 16 that I need to confirm statuses, reservations, and test limits. Here is what I show for k=13854, 16734, and 19464 and their coharts for Riesel base 2 odd-n k=6927 and 8367:

Riesel base 2 odd-n:
k=6927, test limit 261945; now unreserved
k=8367, test limit 262045; now unreserved

Riesel base 4:
k=13854, test limit 130972; now unreserved
k=16734; test limit 131022; now unreserved
k=19464; test limit ??; reserved by Jean

Riesel base 16:
k=13854, test limit 100000; now unreserved (I tested this one separately to n=100000 since we had a sieved file for it. Odd n's would still need testing separately up to n=200000 base 4)
k=16734, test limit 66511; now unreserved
k=19464, test limit ??; reserved by Jean

Can one or both of you verify that the above is correct?

My main question is for Jean:
What is your test limit on k=19464? There was an original post that stated n=93672 base 4. And then a later post that stated n=137000 base 2. Since the later post was a lower range, I've become confused.

Note that all of this is coming about since I'm now incorporating the base 2 even-n and odd-n conjectures into my web pages.

Thanks,
Gary[/QUOTE]

Gary,

I reserved k=19464 because I believed falsely it might be tested for Riesel odd n's (but 19463 is prime), so, I wish to unreserve it.
I tested it up to n = 262032 base 2, then I created a base 4 sieve file up to n=1048576 (1024K) base 4. I will make it available to users by attaching it here. It is sieved up to 49.58 billions.

Regards,
Jean

 Jean Penné 2008-01-24 20:45

Riesel odd n's : 3 new k's eliminated.

3 new primes found :

130383 104123 260766*2^104122-1 is prime! Time : 71.272 sec.
131727 169621 263454*2^169620-1 is prime! Time : 79.613 sec.
135567 68325 271134*2^68324-1 is prime! Time : 23.265 sec.

20 k's remaining now...

Also, for Sierpinski base 4 / odd n's, I completed the test of k = 9267 up to 2,000,000 base 2 (the very last n is 1999615), no prime... so, I am unreserving this k.

Jean

 gd_barnes 2008-01-25 20:56

I'm reserving Riesel base 4 k=13854, 16734, and 19464 for further testing up to about n=250K base 4. I'll sieve to n=500K and leave my files for others if no primes are found on one or more of the k's.

It will also be the same k's for Riesel base 16.

Karsten, this also means I'll be reserving k=6927 and 8367 for the Riesel base 2 odd-n conjecture.

Gary

 gd_barnes 2008-01-25 20:57

Riesel odd-n reservations

Karsten,

Part of a post from the reservations thread...

I'm reserving Riesel base 4 k=13854, 16734, and 19464 for further testing up to about n=250K base 4.

This also means I'll be reserving k=6927 and 8367 for the Riesel base 2 odd-n conjecture and taking them to n=500K base 2.

Gary

 mdettweiler 2008-01-25 22:10

[quote=gd_barnes;123943]I'm reserving Riesel base 4 k=13854, 16734, and 19464 for further testing up to about n=250K base 4. I'll sieve to n=500K and leave my files for others if no primes are found on one or more of the k's.

It will also be the same k's for Riesel base 16.

Karsten, this also means I'll be reserving k=6927 and 8367 for the Riesel base 2 odd-n conjecture.

Gary[/quote]
I thought that base 4 Riesel only covers the even n for base 2? Thus, wouldn't you be reserving it for the even-n conjecture?

 gd_barnes 2008-01-26 10:06

[quote=Anonymous;123951]I thought that base 4 Riesel only covers the even n for base 2? Thus, wouldn't you be reserving it for the even-n conjecture?[/quote]

No, it also covers odd-n IF the k base 4 is divisible by 2, i.e.

Let k=2m and let n=q

2m*4^q-1 = 2m*2^(2q)-1 = m*2^(2q+1)-1

Hence where the base is 4 and k=2m, then where the base is 2, n must be 2q+1; hence odd.

In this case, k=13854 and k=16734 base 4 equate to k=6927 and k=8367 base 2 odd-n.

It's surprising how tricky it has been to keep all of our reservations clean and consistent across all bases without stepping on one another; namely the bases that are powers of 2.

Edit: One more requirement...the k base 4 cannot be divisible by 4 in order to 'reduce' to a base 2 odd-n k. The even-n and odd-n conjectures have a requirement that the k must be odd and divisible by 3 or...as shown on my pages k==3 mod 6.

Gary

 mdettweiler 2008-01-26 16:20

[quote=gd_barnes;123994]No, it also covers odd-n IF the k base 4 is divisible by 2, i.e.

Let k=2m and let n=q

2m*4^q-1 = 2m*2^(2q)-1 = m*2^(2q+1)-1

Hence where the base is 4 and k=2m, then where the base is 2, n must be 2q+1; hence odd.

In this case, k=13854 and k=16734 base 4 equate to k=6927 and k=8367 base 2 odd-n.

It's surprising how tricky it has been to keep all of our reservations clean and consistent across all bases without stepping on one another; namely the bases that are powers of 2.

Edit: One more requirement...the k base 4 cannot be divisible by 4 in order to 'reduce' to a base 2 odd-n k. The even-n and odd-n conjectures have a requirement that the k must be odd and divisible by 3 or...as shown on my pages k==3 mod 6.

Gary[/quote]
Okay, thanks for the explanation. :smile:

 tnerual 2008-01-27 14:12

[QUOTE=gd_barnes;123888]Go Tnerual go! 7707 k's...wow. Good luck! :smile:

G[/QUOTE]

now at n=2414 ... 4960 k's remaining

stopping for 10 days ... hollidays :smile:

all computers switched back to llrnet CRUS1

Gary, can you tag sierp31 as reserved :wink:

see you next week

tnerual

 gd_barnes 2008-01-28 08:39

A big one drops for odd-n...

Base 2 odd-n:
8367*2^313705-1 :smile:

I'm still working on Base 2 odd-n k=6927. I'm currently at n=324K base 2.

Gary

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