Very Prime Riesel and Sierpinski k

[robert44444uk]

So my new candidate has overtaken the Sierpinski best and looks to go best overall, if it is able to keep up its furious pace. I am aware of what happened to the current Sierpinski record holder - a long gap at 180 primes.

I'll take my Riesel champ up to 250K for sure, I'm currently at 147910

Riesel records

171 118689
172 119254
173 129630

Overall records

174 134337
175 134490
176 141805
177 146149

[robert44444uk]

It does take a long time to check candidates in the upper 100,000's.

now at 179 primes with two more absolute record breakers:

178 159874
179 163330

I really want the 181st prime here to get the absolute number of primes record back for Mr. Riesel

[Thomas11]

Originally Posted by robert44444uk

It does take a long time to check candidates in the upper 100,000's.

now at 179 primes with two more absolute record breakers:

178 159874
179 163330

I really want the 181st prime here to get the absolute number of primes record back for Mr. Riesel

Well done so far, Robert! And there is really a good chance for you to get the record back to Mr. Riesel.

Here are the numbers at the Sierpinksi side to beat:

180 197935
181 270758

[robert44444uk]

Originally Posted by Thomas11

Well done so far, Robert! And there is really a good chance for you to get the record back to Mr. Riesel.

Here are the numbers at the Sierpinksi side to beat:

180 197935
181 270758

gosh, well there is a target. I'm running three cores but only during office hours so may take some while to get to 182. At least I know this is up to date information now. At 167500 and no more primes.

[robert44444uk]

180 popped up just as I was leaving work last night. On another console I have found another prime, which is the 181st I have found, but there is an unchecked range 168100-170000 still to complete before we know this is 181 for certain!!

180 168072
181? 174712

[robert44444uk]

My candidate is in a field of its own now:

181 174712
182 177119

I think this will probably have to be tested to 200 primes as it should be 5 ahead or thereabouts of any other candidate tested to 300,000

[robert44444uk]

The candidate is still seriously powering along:

183 177684
184? 190958

There are substantial untested ranges 177700-180000 and 185300-190000 which mean that I can't say for sure that the 190958 is actually number 184.

[Thomas11]

Originally Posted by robert44444uk

The candidate is still seriously powering along:

183 177684
184? 190958

Well done, Robert! Congratulations!

Just let me know if I can help with sieving and/or PFGW testing.

[robert44444uk]

Originally Posted by Thomas11

Well done, Robert! Congratulations!

Just let me know if I can help with sieving and/or PFGW testing.

This is certainly welcome. Maybe if you could help with the sieve and testing starting at 250K. I'll send you the sieve for 200-500K separately to your email.

We should get this to 200 primes quickly then.

[Thomas11]

Originally Posted by robert44444uk

This is certainly welcome. Maybe if you could help with the sieve and testing starting at 250K. I'll send you the sieve for 200-500K separately to your email.

I'm now running 8 instances of ksieve and it's processing pretty fast (ksieve is almost 3 times faster than newpgen). Within about 14 hours I already reached p=800B (starting from p=44B). At this level the elimination rate has dropped to one candidate in about 180 seconds. On my machine (i7, 64bit Linux) this is already quite optimal for tests in the n=200-220k range.

I will keep the machine sieving during the weekend and expect to reach p=4000B (= 4T) on Sunday evening. This should be sufficient for a while, at least up to n=400k.

In case that you run out of test candidates I've sent you the current sieve file (at 800B). Please check your emails...

[Thomas11]

Originally Posted by Thomas11

Here are the numbers at the Sierpinksi side to beat:

180 197935
181 270758

And another one for the Sierpinski side:

182 291662 (tested to n=300k).