20130326, 23:18  #1 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
9,901 Posts 
All top 5000 primes will have the same number of digits in 2014 ;)
I remember the times when 150,000digit primes were enough to enter...
Now, this 283939digit prime is only going to stay for a week in the top5k. 
20130327, 10:24  #2 
May 2007
Kansas; USA
2·31·179 Posts 
When I started in prime searching in 2007, the big push was to get all of the annoying base 2 n=333333 (~100k digits) primes knocked out of the top 5000. I personally still find fixed n searches annoying. The n=1000000 and n=1290000 primes clog up the top 5000 and knock off "good" primes. They also skew the long term curves of the rising 5000th place prime.

20130327, 14:42  #3 
Jun 2009
2^{3}·3·29 Posts 
Fixedn is just about the only way to go if you're looking for twins, sophies, triples etc. The candidates grow much too quickly otherwise.

20130327, 15:21  #4 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
2·3·23·31 Posts 
You could vary n, you just need to search a large k range. Consider if you were to search n=1.0M1.1M. You might lose some sieving efficiency from not having one fixed n, but you'd gain some efficiency by being able to search smaller k's. I don't know which effect is larger.

20130327, 17:27  #5  
Jun 2009
2^{3}·3·29 Posts 
Quote:


20130328, 04:39  #6  
May 2007
Kansas; USA
2×31×179 Posts 
Quote:
All of the n=1290000 primes demotivate smaller searchers because the 5000th place prime rises so rapidly. Soon you will need 50+ cores to have a reasonable chance to find a top 5000 prime within a few weeks. The small guy is quickly being phased out. I guess prime searching is a microcosm of the real world. Last fiddled with by gd_barnes on 20130328 at 04:41 

20130328, 14:47  #7 
Jun 2009
2B8_{16} Posts 
Thanks Gary, now I understand what's bothering you. It's a difficult question. The large BOINC twin or Sophie projects need a lot of small guys working together but many of these small guys would like to have the chance of getting a single prime into the TOP5000 even if the twin test gives a negative result. I don't think many of them would be hunting primes on their own or in a nonBOINC project as we do here.
The bar is raising, that's for sure. On my hunt for triples and quads I am looking at CPUcenturies when aiming for the top and I even have to worry about proving the numbers prime. I am now in the process of proving a number on which primo failed on the first attempt. Fortunately Marcel Martin told me about an entry in the .ini file that seems to have done the trick although it's not finished yet... is there anybody keeping a list of PRP twins, triples, quads etc that are impossible to prove atm? 
20130328, 22:25  #8  
May 2008
Wilmington, DE
2852_{10} Posts 
Quote:
Maybe we should start our own Top100 (think small) for just NPLB & CRUS. Last fiddled with by MyDogBuster on 20130328 at 22:34 

20130328, 23:27  #9 
Mar 2006
Germany
3·23·43 Posts 
The anoying point with PrimeGrid is the fact, that, although there're many participants and so many different prime searches, PG is still unable to make a simple list of primes they've found, like on my pages or like ProthSearch. For search ranges you have to go to their forum, greater primes can be found on the Top5000 page, non Top5000 primes you have to look at their PRPnet resultfiles. Even members seem to have problems, where their found primes go.
I've mentioned this in their forum long long time ago but nothing happend. PG is more in working with challenges and making points for members in different classes instead of making the results available for others in a handsome manner. 
20130329, 00:06  #10 
May 2008
Wilmington, DE
101100100100_{2} Posts 
I used to be a BOINCer until I realized how juvenile the points system is. Any single project can distort their awards and make any measurement mute.
It is a real shame that the last thing PRIME Grid wants to do is actually make finding the prime important. Keep up the good work Karsten. There are people who enjoy your database. Last fiddled with by MyDogBuster on 20130329 at 00:12 
20130329, 01:29  #11 
"Mark"
Apr 2003
Between here and the
1A19_{16} Posts 
I agree with that. BOINC will punish or reward people based upon their hardware. In other words, if you have a specific hardware feature BOINC can increase or decrease your credit regardless of throughput.

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