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1) Message boards : Proth Prime Search : Rediscovered Primes (Message 24625)
Posted 4009 days ago by Jeremy Posner
Measures have been established to minimize re-discoveries. However, this is not 100% as primes can be found by anyone. Nevertheless, the incidence of re-discoveries should decrease substantially.


It seems to have worked. I've been the first to find 3 reportable primes over the last week, and I've actually been cited as the first to find each of them in the Top Primes database. (Well, the third is still being verified, but it was only submitted about 20 minutes ago.)

Thanks...
-JMP
2) Message boards : Proth Prime Search : Rediscovered Primes (Message 22868)
Posted 4070 days ago by Jeremy Posner
We are working on solutions to ensure this doesn't repeat.


Has there been any progress on this? Now that the challenge is over, I'll rejoin the effort to get PPS moving forward, but only if I can get some assurances that if I find a prime it won't have been submitted to the top primes database months before the WU was assigned to me.
3) Message boards : Number crunching : The Earth Day Challenge - discussion (Message 22695)
Posted 4080 days ago by Jeremy Posner
On a serious note, what's the expected maintenance cost on a wind turbine? Solar cells are fairly passive, but a turbine's got bearings and generator parts and stuff.


Wind and solar are cute and all, but I think we're missing out on the real energy bonanza. I think we really need to start capturing the energy of people spinning in their graves.

Got any family members who are living lives that would horrify their deceased (great-)grandparents? Perhaps you work at an old company whose founders would be deeply offended by the ineptitude in the company today. Just as likely, you work at an old company whose founders would be deeply offended by the ethnic diversity in the company. (Or perhaps you live in a large nation with a long history of racists that now has a black President.) There are millions, if not billions of people the world over who are spinning in their graves. Now imagine how much electrical power could be generated by capturing that rotation...

(This was written with tongue firmly planted in cheek, but imagine if people actually did spin in their graves.)
4) Message boards : Number crunching : Badges (Message 22621)
Posted 4083 days ago by Jeremy Posner
I just got my SoB silver badge. It's been a few weeks since I finished my end of the work to get it, but I was waiting on my wingmen. This WU finally came through today, putting me over the 100k threshold.

Now I'm waiting on Cullen LLR to hit silver. I've done all the work, but am waiting on wingmen. I'll probably try to get 321 LLR up to silver next, starting with the Earth Day challenge...
5) Message boards : Proth Prime Search : Rediscovered Primes (Message 22605)
Posted 4084 days ago by Jeremy Posner
PrimeGrid tells me I was the initial discoverer of a fifth prime today. The top 5000 Primes database tells me that PrimeGrid submitted that very same prime in May 2009.

I'll ask again, if the goal is to find new primes, why is PrimeGrid having users retest primes that PrimeGrid has already participated in discovering?

Why should anyone who wants to help discover new primes run PPS on their machines if these ranges have all been tested already?
6) Message boards : Proth Prime Search : Rediscovered Primes (Message 22604)
Posted 4084 days ago by Jeremy Posner
PrimeGrid tells me I was the initial discoverer of a fifth prime today. The top 5000 Primes database tells me that PrimeGrid submitted that very same prime in May 2009.

I'll ask again, if the goal is to find new primes, why is PrimeGrid having users retest primes that PrimeGrid has already participated in discovering?

Why should anyone who wants to help discover new primes run PPS on their machines if these ranges have all been tested already?
7) Message boards : Proth Prime Search : Rediscovered Primes (Message 22580)
Posted 4085 days ago by Jeremy Posner
Obviously PrimeGrid Boinc is having us 'double-check' the some ranges (presumably from PRPNet) so any discoveries are new to PrimeGrid Boinc but old to the world. See John's message earlier in this thread:
Two sections have previously been tested: 497K-498K and 499K-500K. Therefore, that leaves 495K-497K and 498K-499K.

Just hang on as in a couple of days (hopefully) we will finish all the WUs with n<500K - my current WUs have n=499147. Then we should jump to a new range where PrimeGrid should be first.


But I had understood John's message to mean that those ranges had already been tested, therefore we would skip over those ranges. That is, because 497k-498k and 499k-500k had been tested, we would stop at 497k, test the range between those two ranges, then resume testing above the completed ranges. At least that's what I understand the section you quoted to mean. Can someone confirm that things were done that way, or have we been double-checking all of the previously completed work?
8) Message boards : Proth Prime Search : Rediscovered Primes (Message 22578)
Posted 4085 days ago by Jeremy Posner
Once again, I've found a prime that was submitted to the top 5000 list before I found it, with PrimeGrid credited. This is the fourth prime for which PrimeGrid tells me I'm the initial finder (all from PPS), and the fourth that was already in the top primes database before I "discovered" it.

This has got to be fixed.

I'm currently crunching about 45-50 PPS WUs per hour. I understand that the purpose of PrimeGrid is to find new primes, yet PrimeGrid is sending out primes that are already known to be prime. Can someone give a compelling reason why I should bother with PPS if it isn't serving PrimeGrid's nominal function, or explain how checking primes that have already been proven furthers the goal of discovering new primes? In the absence of a compelling answer (which I've been asking for here for several days), I'm going to disable PPS and avoid that project in the future, and will encourage others to do so, as it does not fulfill the goals of PrimeGrid.
9) Message boards : Proth Prime Search : Rediscovered Primes (Message 22577)
Posted 4085 days ago by Jeremy Posner
Once again, I've found a prime that was submitted to the top 5000 list before I found it, with PrimeGrid credited. This is the fourth prime for which PrimeGrid tells me I'm the initial finder, and the fourth that was already in the top primes database before I "discovered" it.

This has got to be fixed.

I'm currently crunching about 45-50 PPS WUs per hour. I understand that the purpose of PrimeGrid is to find new primes, yet PrimeGrid is sending out primes that are already known to be prime. Can someone give a compelling reason why I should bother with PPS if it isn't serving PrimeGrid's nominal function, or explain how checking primes that have already been proven furthers the goal of discovering new primes? In the absence of a compelling answer (which I've been asking for here for several days), I'm going to disable PPS and avoid that project in the future, and will encourage others to do so, as it does not fulfill the goals of PrimeGrid.
10) Message boards : Proth Prime Search : Rediscovered Primes (Message 22495)
Posted 4088 days ago by Jeremy Posner
Is PPS LLR still the LLR Top Priority?

Yes, it will remain a priority until n=500K is reached. Currently, the leading edge is just under n=497K.


Can we get primes that are already on the top 5000 list removed from the work queue? See this thread about the issue. I've found two primes this week for which I was the initial discoverer according to PrimeGrid, yet they had both already been submitted to the top 5000 list with PrimeGrid credited for the effort. If the goal is to find new primes, there's no reason to be wasting resources on numbers that are already known to be prime...
-JMP


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