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Old 2014-08-27, 14:48   #1
EdH
 
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"Ed Hall"
Dec 2009
Adirondack Mtns

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Default Jan Otto Munch Pedersen Availability

Short version:

Is he reachable? I cannot open any of the links from his main pages:

Various Amicable Pair Lists and Statistics
Known Amicable Pairs

I have tried the email listed, but it bounced as undeliverable.

------------------------------------------------------------------------------------
Long Version:

I have many machines searching for 4-cycle (sociable) aliquot sequences currently working in the 6*10^12 area. I'm using 2-cycle (amicable) finds to verify that each machine is working. One of my machines has not found any amicable pairs after searching several 4*10^9 size sections. Since there are less than 10k pairs with 13 digits and I'm really only searching for even first integers (described in this thread), it is possible that the machine in question has really not crossed any. However, to verify, I need to know if there exist any pairs within the sections. I had hoped to use Mr. Pedersen's list of 13 digit amicable pairs, but am not able to retrieve it. If not obtainable, I will need to rerun the sections (at least for amicables) on a different machine to verify.

Alternately, if someone could point me to (a) list(s) elsewhere, it would be appreciated. I would really only need 5.5*10^12 through 6.7*10^12 ATM.

Thanks!
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Old 2014-08-27, 19:12   #2
R. Gerbicz
 
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"Robert Gerbicz"
Oct 2005
Hungary

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Here it is: http://www.filedropper.com/c213

I have all the amicable pairs, and sociable pairs from that site. But currently I do not see more (unitary pairs etc.). I can upload it. (in compressed format it is 1.8 Gb).

In 2010 and 2012 I have also sent him an email, and there was no answer or undeliverable error.

Just out of curiosity he (or someone else with the same name) has Fide rating, played 13 rated chess games in last year.
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Old 2014-08-27, 22:38   #3
EdH
 
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"Ed Hall"
Dec 2009
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Thanks for the file R. Gerbicz. It's all I need for now. The last few sections that have been run by the questionable machine have no amicable pairs that should have been found. Interestingly, the current section has no pairs, either. I may need to be particular with the next region selection for that machine.

Again, thanks...
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Old 2014-09-22, 14:24   #4
MichelMarcus
 
Nov 2011
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The pages you quote seem to be still accessible.
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Old 2014-09-23, 13:38   #5
EdH
 
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"Ed Hall"
Dec 2009
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Quote:
Originally Posted by MichelMarcus View Post
The pages you quote seem to be still accessible.
While the pages, e.g. Known Amicable Pairs, are there, I can not retrieve any of the text files referenced on the pages, e.g. 13 digits, which promises a list of 9877 pairs.

If you can retrieve the files, then I am stumped as to why I can't retrieve text files from this site while other sites give me no trouble. I suspect they were moved and there wasn't enough interest to correct all the links. Possibly a server change?
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Old 2014-09-28, 14:29   #6
MichelMarcus
 
Nov 2011
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Oh yes, you're right. I saw it afterwards.
So I searched with http://archive.org/web/.
I found some of his files but not the ones you wanted.
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Old 2014-12-23, 18:49   #7
Drdmitry
 
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Nov 2011

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Quote:
Originally Posted by R. Gerbicz View Post
Here it is: http://www.filedropper.com/c213

I have all the amicable pairs, and sociable pairs from that site. But currently I do not see more (unitary pairs etc.). I can upload it. (in compressed format it is 1.8 Gb).

In 2010 and 2012 I have also sent him an email, and there was no answer or undeliverable error.

Just out of curiosity he (or someone else with the same name) has Fide rating, played 13 rated chess games in last year.
Could you please share c2_16.txt, c2_17.txt and c2_18.txt files? I currently discovered a number of amicable pairs of this size and want to check whether they were found before. Thank you.
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Old 2014-12-23, 19:03   #8
R. Gerbicz
 
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"Robert Gerbicz"
Oct 2005
Hungary

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Here it is:
http://www.filedropper.com/c216
http://www.filedropper.com/c217
http://www.filedropper.com/c218
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Old 2015-03-13, 13:37   #9
Maciej
 
Mar 2015

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Patrick Costello site:


http://math.eku.edu/amicable-pairs-download
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Old 2015-03-13, 16:34   #10
EdH
 
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Quote:
Originally Posted by Maciej View Post
Excellent! Thanks Much..
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Old 2015-11-26, 00:12   #11
janmp
 
Nov 2015

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Sorry for being inactive for many years! (partly due to health problems)

The last update of my web site (from 2007) is available at http://62.198.248.44/aliquot/tables.htm

Sergei Chernykh has started a database/web page on AP's at http://sech.me/ap/index.html

The must updated place for social numbers is (as always): http://djm.cc/sociable.txt

Cheers
Jan
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