Choose your own K and work on finding a top-5000 prime! - Page 26

SaneMur · 2011-07-26, 15:05

Quote:

Originally Posted by kar_bon

Sure, misleading used phrase of mine. Thanks for the remark.

And what is the difference between the 258 and 257?

I'd like to reserve k=2889081195 which has a very high Nash weight (7000+) but it has not been worked on for ages and seems to be available.

If so, I'll start sieving on it when I get the approval.

amphoria · 2011-07-26, 16:20

We can't really give any sort of formal approval. However, this k has clearly not been worked on for a long time so go ahead and reserve it.

SaneMur · 2011-07-26, 17:29

Quote:

Originally Posted by amphoria

We can't really give any sort of formal approval. However, this k has clearly not been worked on for a long time so go ahead and reserve it.

OK. Well I will start sieving on it later tonight when I have a core freed up, no harm in doing that at least. I ordered a new computer which should be delivered one day next week. By then this k will be sieved pretty good and I'll give it to my new computer if there has been no further objections by then.

kar_bon · 2011-07-26, 17:47

Quote:

Originally Posted by SaneMur

And what is the difference between the 258 and 257?

See the file 'newpgenformats.txt' given with NewPGen.exe:

Code:

// Here are the NewPGen format's
<sieve limit>:<mode character>:<chain len>:<base>:<mode bitmap as a decimal>

Mode character:
    'P' +1
    'M' -1
(...)

BitMap:
     0x0001   k*2^n+1        k*n#+1
     0x0002   k*2^n-1        k*n#-1
     0x0004   k*b^(n+1)+1    2k*n#+1
     0x0008   k*b^(n+1)-1    2k*n#-1
     0x0010   k*b^(n-1)+1    .5k*n#+1
     0x0020   k*b^(n-1)-1    .5k*n#-1
     0x0040   Primorial
     0x0080   3-tuple and 4-tuple (PLUS5 - used in the triplet sieve.)
     0x0100   Mode 'k' sieve (variable k's)

So 258 (dez) is 102 (hex) (combination of 0x0100 and 0x0002) -> "Mode 'k' sieve (variable k's)" for "k*2^n-1" and
257 (dez) is 101 (hex) -> "Mode 'k' sieve (variable k's)" for "k*2^n+1".

SaneMur · 2011-07-30, 19:18

My new computer arrived this morning, ahead of schedule, what a nice surprise.

An even better surprise: In less than 6 hours of use, it has found a top 5000 prime!

I am happy to report my first top-5000 prime should come in around #2209:

(11235813 * (2^775082)) - 1 is prime!

VBCurtis · 2011-07-30, 19:28

SaneMur-
Congratulations! Way to break in your new machine. A little beginner's luck mixed with a lot of enthusiasm- it's fun to see someone find their first.

Note we have a thread specifically dedicated to reporting primes- now that you're finding top-5000 primes, you should use that thread too. The threads are helpfully named; this current thread for reservations and occasional status updates, the prime reporting thread for just that.
-Curtis

SaneMur · 2011-07-30, 19:33

Quote:

Originally Posted by VBCurtis

SaneMur-
Congratulations! Way to break in your new machine. A little beginner's luck mixed with a lot of enthusiasm- it's fun to see someone find their first.

Thanks!

I'd also like to credit my 5.4 gigahertz computer! This thing is loud, heavy, and fun to watch (from the next room).

This thread is called "Choose your own K and work on finding a top-5000 prime!" so did I not post this in the correct place? I surely chose my own K and made it to the top 5000.

SaneMur · 2011-09-17, 23:44

Well Hurricane Irene was not too kind to us. No real serious damage from falling trees or anything, but lots and lots of water. Fire company had to come and pump out the basement. One of my two computers is done for (fortunately not the new one).

Just restarted doing some primes so nothing to post in terms of updates.

Kosmaj · 2013-01-05, 03:02

k=7605 is now at 1240k and the total of 102 primes have been found.

The first 100 primes, up to 892k, I reported here

Primes found between 892k and 1240k:
7605*2^1016474-1 (305994 digits)
7605*2^1027719-1 (309379 digits)

legendarymudkip · 2014-10-10, 15:55

would like to reserve k=314159

VBCurtis · 2015-04-05, 19:29

It has been quite a long time since I updated the k's I work on above 300:
k = 405 complete to 1.41M
k = 443 complete to 2.31M
k = 2115 complete to 1.33M
k = 2145 complete to 1.36M
k = 2175 complete to 1.27M

405 and 443 ran on ancient P4-celerons until recently, so progress was very slow. 405 is now on a new i3 laptop, 443 on i7 desktop.
The 2000's are in cooperation with sjtjung (Steven) and chaos13 (Kristine).

2013-01-05, 03:02	#284
Kosmaj Nov 2003 2·1,811 Posts	k=7605 k=7605 is now at 1240k and the total of 102 primes have been found. The first 100 primes, up to 892k, I reported here Primes found between 892k and 1240k: 76052^1016474-1 (305994 digits) 76052^1027719-1 (309379 digits)

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2011-07-26, 16:20	#277
amphoria "Dave" Sep 2005 UK 5330₈ Posts	We can't really give any sort of formal approval. However, this k has clearly not been worked on for a long time so go ahead and reserve it.

2011-07-30, 19:18	#280
SaneMur Jul 2011 3²·13 Posts	My new computer arrived this morning, ahead of schedule, what a nice surprise. An even better surprise: In less than 6 hours of use, it has found a top 5000 prime! I am happy to report my first top-5000 prime should come in around #2209: *(11235813 (2^775082)) - 1** is prime!

2011-07-30, 19:28	#281
VBCurtis "Curtis" Feb 2005 Riverside, CA 2²×1,217 Posts	SaneMur- Congratulations! Way to break in your new machine. A little beginner's luck mixed with a lot of enthusiasm- it's fun to see someone find their first. Note we have a thread specifically dedicated to reporting primes- now that you're finding top-5000 primes, you should use that thread too. The threads are helpfully named; this current thread for reservations and occasional status updates, the prime reporting thread for just that. -Curtis

2011-09-17, 23:44	#283
SaneMur Jul 2011 117₁₀ Posts	Well Hurricane Irene was not too kind to us. No real serious damage from falling trees or anything, but lots and lots of water. Fire company had to come and pump out the basement. One of my two computers is done for (fortunately not the new one). Just restarted doing some primes so nothing to post in terms of updates.

2014-10-10, 15:55	#285
legendarymudkip Jun 2014 2³·3·5 Posts	would like to reserve k=314159

2015-04-05, 19:29	#286
VBCurtis "Curtis" Feb 2005 Riverside, CA 2²·1,217 Posts	It has been quite a long time since I updated the k's I work on above 300: k = 405 complete to 1.41M k = 443 complete to 2.31M k = 2115 complete to 1.33M k = 2145 complete to 1.36M k = 2175 complete to 1.27M 405 and 443 ran on ancient P4-celerons until recently, so progress was very slow. 405 is now on a new i3 laptop, 443 on i7 desktop. The 2000's are in cooperation with sjtjung (Steven) and chaos13 (Kristine).