no twin left behind? - Page 5

davar55 · 2011-01-30, 18:00

Quote:

Originally Posted by Mini-Geek

Not as far as I know, but I don't know of any serious ECM attempts, just that old TF to 2^32. Here are the FactorDB entries for those:
http://factordb.com/index.php?query=2^4253-3
http://factordb.com/index.php?query=2^11213-3

I started a db as a new thread in Data, M-2 something or other.

mart_r · 2011-02-03, 21:04

Quote:

Originally Posted by Mini-Geek

I was not aware of these twin primes. Is the pair listed on a list anywhere, or did you just find the pair, or what? A google search can't find it, and it's not large enough to be on any list I can see. I can confirm with PFGW that they are primes. (the number between the primes is easily trial factored to at least 33.34%)

Hehe, I wondered if I should tell where I "found" it, but I was interested in whether you'd find out by yourself...
It's from the largest known prime triplet that doesn't contain a ±1 twin, found in March 2006 by Ken Davis.

henryzz · 2011-02-07, 19:54

Quote:

Originally Posted by henryzz

It will be about 100 hours of processing for phase 1. 4% done now. Begining to think multithreading is a waste of time for this small a number. I am running 2 threads and thread one has had 5/6 of the successes so far.

100 hours was a rubbish estimate based on lucky findings. 350 hours seems more likely now. I am now at test 43 14575/15526.

henryzz · 2011-02-25, 20:36

Thought I would post an update.

Now at Test 222 10226/15526 which means 21% left of phase 1. Not long now.

henryzz · 2011-03-05, 13:23

Quote:

Originally Posted by henryzz

Thought I would post an update.

Now at Test 222 10226/15526 which means 21% left of phase 1. Not long now.

Phase 1 finished today.

henryzz · 2011-03-26, 20:28

5789*2^15513+3 is proven prime after 228h 47mn 25s
The proof is at http://www.sendspace.com/file/peur1w
Could someone please do a verify run on another pc preferably using the alternative verification software which is somewhere in the five or bust forum.

Mini-Geek · 2011-03-26, 22:09

Quote:

Originally Posted by henryzz

5789*2^15513+3 is proven prime after 228h 47mn 25s
The proof is at http://www.sendspace.com/file/peur1w
Could someone please do a verify run on another pc preferably using the alternative verification software which is somewhere in the five or bust forum.

FactorDB is now processing your certificate (I uploaded it to it). It does not use Primo, but the alternative verification software you mention.
Primo 3.0.9, running on my box, says your certificate signature is valid.
Thanks for running this verification.

Mathew · 2011-07-14, 23:11

7027*2^13017-3 is currently being processed.

Mathew · 2011-09-12, 06:27

755*2^13474-3 is currently being processed

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2011-02-25, 20:36	#48
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2³·3·5·7² Posts	Thought I would post an update. Now at Test 222 10226/15526 which means 21% left of phase 1. Not long now.

2011-03-26, 20:28	#50
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2³×3×5×7² Posts	5789*2^15513+3 is proven prime after 228h 47mn 25s The proof is at http://www.sendspace.com/file/peur1w Could someone please do a verify run on another pc preferably using the alternative verification software which is somewhere in the five or bust forum.

2011-07-14, 23:11	#52
Mathew Nov 2009 536₈ Posts	7027*2^13017-3 is currently being processed.

2011-09-12, 06:27	#53
Mathew Nov 2009 2×5²×7 Posts	755*2^13474-3 is currently being processed