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-   -   Bases 251-500 reservations/statuses/primes (https://www.mersenneforum.org/showthread.php?t=12993)

 grobie 2008-04-18 17:26

reserving the following 7 Riesel Base 256 k's:
1695
2237
2715
2759
3039
3147
3155

I am not sure how far I will take them, but no more than 50k might be less, I am going to orientation for a new job soon out of town, so I don't want to commit to anything big.

 grobie 2008-04-20 04:42

3155*256^27010-1 is prime
3155*2^216080-1 is prime!

Let me know if I need to do anything else with this.

 gd_barnes 2008-04-20 07:08

[quote=grobie;131887]3155*256^27010-1 is prime
3155*2^216080-1 is prime!

Let me know if I need to do anything else with this.[/quote]

Nope, nothing more to do. Karsten should automatically list it on his 2000 < k < 4000 page when he gets it updated.

Nice work! It's good to knock out some of the base 256 k's. There's a very large # of k's remaining for such a high base.

Gary

 grobie 2008-04-30 02:56

[QUOTE=grobie;131887]3155*256^27010-1 is prime
3155*2^216080-1 is prime!

Let me know if I need to do anything else with this.[/QUOTE]

Here is another one for Riesel Base 256:
3039*2^281056-1 is prime!:smile:

 grobie 2008-05-29 02:00

1 Attachment(s)
[QUOTE=grobie;131843]reserving the following 7 Riesel Base 256 k's:
1695
2237
2715
2759
3039
3147
3155

[/QUOTE]

All k's completed to 50k 2 primes already reported, no additional primes.

 gd_barnes 2008-06-27 20:22

I'm reserving all remaining unreserved Riesel base 256 k-values (41 total k's). I'll take them from n=25K-75K (n=200K-600K base 2). This will be a double-check for the lower ranges on some of them.

Sieving has complete to P=1T, which is sufficient up to n=50K. Starting at only n=25K, I will initially will have only one high-speed core on it but will work up to having a full quad on it.

My goal is to have all powers-of-2 bases k-values up to n=600K base 2 by the end of Sept. Riesel and Sierp base 16 are close (n=560K base 2) and there are several even-n and odd-n conjectures k-values that are near n=400K that need to be pushed a little to accomplish this.

Edit: Although I am double-checking several k's that are already searched past n=75K, I won't show them as reserved since technically I'm not searching any new range on them. Anyone is free to reserve any k-value and test it above n=75K.

Gary

 gd_barnes 2008-06-29 19:09

5139*256^30740-1 is prime

 gd_barnes 2008-07-02 08:43

2 primes from Riesel base 256:

5027*256^28873-1 is prime
4137*256^29273-1 is prime

44 k's to go and testing is complete to n=32.8K on two cores.

Gary

 gd_barnes 2008-07-04 01:23

Riesel base 256 at n=33.5K; one prime reported for n=30K-35K; continuing.

 gd_barnes 2008-07-08 20:49

3855*256^36666-1 is prime

Riesel base 256 currently at n=37K with 43 k's remaining.

 gd_barnes 2008-07-10 00:01

5247*256^36991-1 is prime

42 k's now remaining.

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