mersenneforum.org Sequence terminations and merges
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2012-02-12, 04:38   #276
schickel

"Frank <^>"
Dec 2004
CDP Janesville

2×1,061 Posts

Quote:
 Originally Posted by fivemack Yes, the secret is 'mine the richest seams first', where the richest seams of aliquots are precisely those where the terms are smallest. I on the other hand have now taken 9436 from 128 digits to 165 digits with 2*3 intact all the way.
I would attribute the number of successes more to the fact that his workers are running all the unreserved sequences. If you bet on 1000+ horses to win, you're much more likely to have one hit than if you bet on one horse. (Of course, it helps if you have the resources to bet on the 1000!)

2012-02-12, 04:47   #277
schickel

"Frank <^>"
Dec 2004
CDP Janesville

2·1,061 Posts

Quote:
 Originally Posted by kar_bon 438966:i4722 = 244464:i0
Actually, you're a little off:

438966:i4720 = 5748:i15 = 246584

Last fiddled with by schickel on 2012-02-13 at 03:07 Reason: Made a typo caught by kar_bon

 2012-02-12, 17:55 #278 bchaffin   Sep 2010 Portland, OR 17416 Posts Speaking of successes, 712068 terminates at term 3235, from a max height of 114 digits. Attached Thumbnails
 2012-02-13, 07:51 #279 schickel     "Frank <^>" Dec 2004 CDP Janesville 212210 Posts Wow, two in one weekend!
2012-02-13, 12:12   #280
fivemack
(loop (#_fork))

Feb 2006
Cambridge, England

24×3×7×19 Posts

Quote:
 Originally Posted by schickel I would attribute the number of successes more to the fact that his workers are running all the unreserved sequences. If you bet on 1000+ horses to win, you're much more likely to have one hit than if you bet on one horse. (Of course, it helps if you have the resources to bet on the 1000!)
I have comparable resources (can do a C155 every three or so days), but since I'm applying them something closer to largest-composite-first rather than smallest-composite-first, I am not getting as many terminations.

2012-02-13, 19:45   #281
bchaffin

Sep 2010
Portland, OR

22·3·31 Posts

Quote:
 Originally Posted by fivemack I have comparable resources (can do a C155 every three or so days), but since I'm applying them something closer to largest-composite-first rather than smallest-composite-first, I am not getting as many terminations.
Yes, exactly. I do work on all 9000+ open sequences, but not all at once -- these days I have about 24 threads running at lowest priority on hyper-threaded machines shared with other tasks. That's more resources than many forum members, maybe, but a lot less than others like fivemack and bsquared. And I've done my share of reserving specific sequences -- trying to pick a winner on my own -- and devoting substantial resources to pushing them to 140+ digits.

All of which is good fun, of course. It's way more exciting to get a downdriver at 130 digits than at 110. But despite knowing about drivers and escapes, I haven't proven very good at picking winners -- for me by far the best strategy for achieving terminations has been to just add as many terms as possible to whatever sequence.

So to each his own. I'll keep picking away at the low end, and fivemack can go for the digit records with his 48-core monster.

2012-02-17, 12:57   #282
Mini-Geek
Account Deleted

"Tim Sorbera"
Aug 2006
San Antonio, TX USA

17×251 Posts

Quote:
 Originally Posted by unconnected Lucky hit on 587994
.

2012-02-18, 05:46   #283
schickel

"Frank <^>"
Dec 2004
CDP Janesville

2·1,061 Posts

Quote:
 Originally Posted by Mini-Geek .
Noted. I was just busy having fun with my main sieving box (check the air/water cooling thread later for details).

That sure is a nice drop!
Attached Thumbnails

 2012-02-19, 02:38 #284 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 3·5·17·37 Posts 417600 is no more. It's pined for the fjords. It's an ex-sequence. Bereft of life, it rests in peace!
2012-02-22, 08:43   #285
schickel

"Frank <^>"
Dec 2004
CDP Janesville

84A16 Posts

Quote:
 Originally Posted by Batalov 417600 is no more. It's pined for the fjords. It's an ex-sequence. Bereft of life, it rests in peace!
Sorry, I forgot to update the record with this one....

I hope there are still some out there for the rest of us!

 2012-02-22, 11:50 #286 LaurV Romulan Interpreter     Jun 2011 Thailand 223548 Posts Side question: are you (schickel) double-checking the elf files before erasing them from the copybook? Since the stories with scrambled sequences on the DB my back sweats every time I hear a sequence terminates :P

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