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2011-07-26, 15:05   #276
SaneMur

Jul 2011

32·13 Posts

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.

 2011-07-26, 16:20 #277 amphoria     "Dave" Sep 2005 UK 2·19·73 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.
2011-07-26, 17:29   #278
SaneMur

Jul 2011

32·13 Posts

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.

2011-07-26, 17:47   #279
kar_bon

Mar 2006
Germany

2,767 Posts

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".

 2011-07-30, 19:18 #280 SaneMur   Jul 2011 11101012 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 2×2,003 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
2011-07-30, 19:33   #282
SaneMur

Jul 2011

32·13 Posts

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.

 2011-09-17, 23:44 #283 SaneMur   Jul 2011 32×13 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.
 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: 7605*2^1016474-1 (305994 digits) 7605*2^1027719-1 (309379 digits)
 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 2·2,003 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).

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