Riesel Base 72
 

Riesel Base 72 at n=300K continuing (1k remaining)

Here's a good one:

647*72^60536+1 is prime!

That leaves only k=493 remaining on S72. It is currently at n=62K.

Another one for the 1k list. :smile:

S35 status at n=20K.
75 k's eliminated, 625 k's remaining.

Primes for this range are attached (k=7346 gave 2 primes).

Continuing to n=25K.

R48 is complete to n=50K. I am releasing the base.

3 more primes since last status.

352*48^40976-1
1268*48^44785-1
1231*48^48558-1

The results will be emailed to Gary.

Reserving S55 all k's to n=100K.


edit: I think I'll sieve R55 together. So also reserving R55 to n=100K for sieving only.

[quote]Reserving S55 all k's to n=100K.
edit: I think I'll sieve R55 together. So also reserving R55 to n=100K for sieving only. [/quote]I hope your not intending to sieve S55 and R55 together. srsieve can't handle that. 1 base at a time. S55 and R55 are considered separate bases.

I don't think srsieve will even give you an error but it will assume ALL k's are for the same base, the first listed. Ian

[quote=MyDogBuster;215513]I hope your not intending to sieve S55 and R55 together. srsieve can't handle that. 1 base at a time. S55 and R55 are considered separate bases.

I don't think srsieve will even give you an error but it will assume ALL k's are for the same base, the first listed. Ian[/quote]
Really? Then how do projects like Sierpinski/Riesel base 5 do it? Also, Gary recently did R/S26 together in a similar fashion. Do such sieves have to be started separately with srsieve, then merged for continuation with sr2sieve?

srsieve can only handle one base at a time, but the Riesel and Sierp sides of the same base (e.g. R55 and S55) aren't considered separate bases.

[quote=vmod;215510]Reserving S55 all k's to n=100K.


edit: I think I'll sieve R55 together. So also reserving R55 to n=100K for sieving only.[/quote]

Great idea! Much CPU efficiency is gained as long as there is not a wide disparity in the # of k's remaining between the 2 sides, which there definitely isn't for base 55.

Ian, srsieve and sr2sieve can easily handle R55 and S55 sieved together. I do that quite frequently. I recommend it for quite a few of your efforts where you end up running both sides of the same base. sr2sieve saved quite a bit of time doing R26/S26 together and I'm now doing the same with R27/S27 together, which needs a tremendous amount of sieveing on both sides before it can be tested further.

sr1sieve is the one that cannot handle more than one base. For that matter, it can only handle one sequence. But it's very fast for that purpose.

As a point of reference on my Windows machines, I'm using srsieve 0.6.16 and sr2sieve 1.8.11. I think they are close to the latest versions.


Gary

Geez, ya learn something everyday. I could swear I tried it and it didn't like it. My bad.

Mathew has provided a sieve file for R48 for n=50K-100K sieved to P=500G. A link is now on the reservations page.