20111216, 03:10  #727  
Romulan Interpreter
Jun 2011
Thailand
2^{5}·5·59 Posts 
Quote:
Who said "Fear the 2^3*3*5" was damn right! 

20111216, 04:44  #728  
"Ed Hall"
Dec 2009
Adirondack Mtns
47·79 Posts 
Quote:


20111217, 18:12  #729  
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
5,869 Posts 
Quote:


20111219, 05:24  #730 
Romulan Interpreter
Jun 2011
Thailand
2^{5}·5·59 Posts 
7 had nothing to do here, it comes and goes every few terms, unless you manage to get 2^2, when 3 and 5 will come and go and 2^2*7 will stay. What I call "driver" is always a number of the form 2^n*(2^(n+1)1), with 2^(n+1)1 being prime or not. These are the most persistent, no mater if they are perfect numbers or not (they are perfect numbers when 2^(n+1)1 is prime, therefore a mersenne prime). Like 2*3, 2^2*7, 2^3*3*5, 2^4*31, 2^6*127... 2^10*23*89... 2^12*8191... etc. And even from this list, some of them are missing, they are only guides, for example 2^5*3^2*7 (i.e. n=5), this is not very persistent due to the even power of 3. They are more and more persistent as n is higher, and they make the sequence grow faster and faster when n is smaller and very smooth composite.

20111219, 08:39  #731 
"Frank <^>"
Dec 2004
CDP Janesville
2·1,061 Posts 
I posted a complete status update over in the reservation thread.

20111219, 10:50  #732 
Jun 2003
3^{2}×19×29 Posts 
He meant, 2^3*3*5*7 (840) is an example of a sequence with the 2^3*3*5 driver. Examining that will help you see how the driver is lost (http://www.factordb.com/sequences.ph...nge&fr=0&to=21)

20111219, 14:30  #733 
Romulan Interpreter
Jun 2011
Thailand
2^{5}·5·59 Posts 
Aaaa! Ok. Now I understand what he said. Sorry for being dumb. Of course I am doing the same, studying sequences with small start numbers. I did this repeatedly, usually adding *19*37 after the drivers, or some equivalent.

20111226, 19:48  #734 
Apr 2010
Over the rainbow
11×233 Posts 
releasing 412944, i2621, size 138, 2^2*3*5*7*619944163* C127

20111228, 14:55  #735 
"Forget I exist"
Jul 2009
Dumbassville
10000011000000_{2} Posts 
you'll be happy to know I got aliquot back up and running off my old PC, now to get prime95 to not be copied as a short cut and I might be up and running working on a C104 in this current sequence.
I should probably test the machine first and 2 I forgot to get perl again. Last fiddled with by science_man_88 on 20111228 at 15:03 
20111228, 17:45  #736  
"Forget I exist"
Jul 2009
Dumbassville
2^{6}·131 Posts 
Quote:


20120101, 07:28  #737 
Sep 2010
Portland, OR
174_{16} Posts 
And, just in time for the new year (in my time zone, anyway)... the elves have finished all the c108s in open unreserved sequences!
Happy new year, everyone! 
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