mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > FactorDB

Reply
 
Thread Tools
Old 2012-05-24, 09:58   #1
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

2×1,061 Posts
Default Broken aliquot sequences

Quote:
Originally Posted by Andi47 View Post
What about opening a "Broken aliquot sequences" thread and moving these postings there?

BTW: What is the problem with these sequences - did I miss something?
I think all the errors are a result of some composites having been marked as prime. These are the ones I know of for sure. (Two other sequences, 116424 & 363270, seem to have been fixed by the recent repair activity.)

---------------------

75402 transition error i2501-->i2502
Code:
 2501 .  358729443207142703797412198103463684902 = 2 * 3 * 23 * 76611233 * 6971077819 * 4867383372371032277
 2502 .  389923307833850766552803688805580016090 = 2 * 3 * 5 * 5325225012394697 * 2440731342658679542699
\sigma(n)-n = 389923317713346464092498767474155507418

73962 transition error i374-->i375
Code:
 374 .   1003615125130244858389990794712849904224 = 2^5 * 7 * 193 * 139608823 * 197728627 * 237846283 * 3535762499
 375 .   1266219103764869625039654462097253884832 = 2^5 * 7 * 37 * 3923 * 1760477 * 675376420931 * 32754016329539
\sigma(n)-n = 1266219120665364130295017236417031695776

174888 transition error i142-->i143
Code:
 142 .   8734000210977209181752 = 2^3 * 37 * 193 * 207715517 * 736029527
 143 .   8171995856272822285048 = 2^3 * 60733 * 16819512983618507
\sigma(n)-n = 8171995960632149250568

459980 transition error i422-->i423
Code:
 422 .   329992544768702371960 = 2^3 * 5 * 23 * 296692309 * 1208954657
 423 .   444772560340424938280 = 2^3 * 5 * 15217 * 10666679 * 68504599
\sigma(n)-n = 444772563592622384840

700128 incorrect factorization
Code:
 230 .   48208034886996010726 = 2 * 7^2 * 491918723336693987
Should be:
Code:
48208034886996010726 = 2 * 7^2 * 436433279 * 1127133853
722430 incorrect factorization
Code:
 214 .   4594320088968565383718592 = 2^6 * 23 * 43 * 127 * 571532936236665001
Should be:
Code:
4594320088968565383718592 = 2^6 * 23 * 43 * 127 * 136035463 * 4201352527
864792 transition error i250-->i251
Code:
 250 .   12762105846926757096 = 2^3 * 3 * 88225271 * 6027234649
 251 .   19143158770390135704 = 2^3 * 3 * 19 * 41980611338574859
\sigma(n)-n = 19143159137317730904
schickel is offline   Reply With Quote
Old 2012-05-24, 12:27   #2
unconnected
 
unconnected's Avatar
 
May 2009
Russia, Moscow

2,441 Posts
Default

+473892

ERROR: @index 1195: value != sigma - n
unconnected is offline   Reply With Quote
Old 2012-05-25, 13:14   #3
Stargate38
 
Stargate38's Avatar
 
"Daniel Jackson"
May 2011
14285714285714285714

2·13·23 Posts
Default

From sequence 473892: 513868719334739387 is not prime:

http://www.factordb.com/index.php?id=513868719334739387

You may need to hit F5 a couple of times to see what I mean.

513868719334739387C=132018421*3892401647=513868719334739387P? Strange. Why does the DB detect it as both prime and composite at the same time?

Last fiddled with by Stargate38 on 2012-05-25 at 13:17
Stargate38 is offline   Reply With Quote
Old 2012-06-01, 05:53   #4
unconnected
 
unconnected's Avatar
 
May 2009
Russia, Moscow

46118 Posts
Default

+239520
ERROR: @index 91: value != sigma - n

+464800
ERROR: @index 85: value != sigma - n

The same problem with 40320, 43974, 384330.

Last fiddled with by unconnected on 2012-06-01 at 06:02 Reason: add more broken seqs
unconnected is offline   Reply With Quote
Old 2012-06-01, 10:10   #5
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

1000010010102 Posts
Default

I've been working on pulling a complete status update and it looks like the problems are increasing. (Maybe a bad index or somewhat?)

Complete list so far:
Code:
 40320  i503 bad factor (indicates a composite number that is showing as prime)
 43974  i325 bad factor
 73962  i374-->i375 (indicates the sigma for the lower line was calculated wrong)
 75402  i2501-->i2502
131160  i559 bad factor
174888  i142-->i143
239520  i90-->i91
384330  i419-->i420
459980  i422-->i423
464800  i84-->i85
473892  i1194-->i1195
506322  i113 bad factor
566712  i1092-->i1093
583308  i145-->i146
604200  i1076-->i1077
608286  i2114-->i2115
641592  i1466-->i1467
700128  i230 bad factor
722430  i214 bad factor
864792  i250-->i251
schickel is offline   Reply With Quote
Old 2012-06-02, 03:32   #6
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

84A16 Posts
Default

Found a few more in stage 3 of my download:
Code:
745824  i1377-->i1378
771870  i1494 bad factor
846900  i478-->i480
schickel is offline   Reply With Quote
Old 2012-06-18, 08:32   #7
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

84A16 Posts
Default

Looks like some of the problems are being fixed. In the process of uploading some work on my sequences, lines that have been done in the past are showing up as "Checked, new" or "Unchecked, new". Some of the sequences with incorrect sigma calculations are OK now, but the incorrect factorizations I checked are not yet.....
schickel is offline   Reply With Quote
Old 2012-08-04, 03:21   #8
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

1000010010102 Posts
Thumbs up

I haven't checked them all yet, but it looks like the sequences that had problems have been fixed.
schickel is offline   Reply With Quote
Old 2012-08-04, 03:43   #9
Dubslow
Basketry That Evening!
 
Dubslow's Avatar
 
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

3×29×83 Posts
Default

Quote:
Originally Posted by schickel View Post
I haven't checked them all yet, but it looks like the sequences that had problems have been fixed.
As I reported in the new thread, 747720 is still broken (and was newly broken after the last DB flush).
Dubslow is offline   Reply With Quote
Old 2012-08-04, 07:02   #10
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

1000010010102 Posts
Talking

Quote:
Originally Posted by Dubslow View Post
As I reported in the new thread, 747720 is still broken (and was newly broken after the last DB flush).
OK, more precisely: I checked all the sequences reported in this thread up past the point they were broken before and found no errors.*

Here is the status of the one I checked:
Quote:
Originally Posted by FactorDB
40320 1358. sz 117 2^3 * 3^2 * 5 * 169493
43974 4369. sz 116 2^2 * 3^3 * 7
73962 748. sz 114 2^2 * 7 * 13 * 191
75402 3595. sz 135 2^4 * 11 * 31 * 331 * 9157
131160 1916. sz 121 2^3 * 3 * 5 * 103 * 727
174888 1751. sz 117 2^3 * 3 * 5 * 43 * 58377191 * 18579467520826127
239520 972. sz 115 2^3 * 3^3 * 11 * 113 * 433 * 3701 * 4457860265072911
384330 3001. sz 117 2^2 * 3 * 7 * 89 * 281 * 19147270185547678373162923
459980 2449. sz 118 2^7 * 3 * 5 * 109
464800 2384. sz 116 2^2 * 3 * 31
473892 2454. sz 114 2 * 3 * 373
506322 2994. sz 115 2^2 * 3 * 7^2 * 431
566712 1249. sz 113 2 * 3^3 * 5 * 7 * 823
583308 1185. sz 118 2^4 * 3 * 31
604200 1393. sz 119 2^4 * 3 * 239
608286 3593. sz 115 2^3 * 3 * 7
641592 1610. sz 114 2 * 3^2
700128 1863. sz 117 2^5 * 3^2 * 11 * 2927 * 28683833
722430 1508. sz 120 2^3 * 7 * 11 * 41
745824 3339. sz 113 2^2 * 5 * 7 * 149 * 947
771870 3086. sz 117 2 * 3^2 * 23 * 691 * 12211
846900 2118. sz 113 2 * 3^3 * 17 * 18149
864792 1043. sz 113 2 * 3 * 1517376277 * 7660170200354084659
As to why the other reported errors are still there, only Syd knows for sure.....maybe he likes me better? (Or maybe he's fixing them in the order they were reported? Or maybe.....?)

* Anecdotal evidence only. You mileage may vary, past results do not predict future returns, not intended for human consumption, (C), (R), & (TM), all rights reserverd.
schickel is offline   Reply With Quote
Old 2013-04-26, 05:42   #11
schickel
 
schickel's Avatar
 
"Frank <^>"
Dec 2004
CDP Janesville

2×1,061 Posts
Unhappy

Can't download .elf files at the moment. From the browser there's no response, haven't waited long enough to get a time-out, but I assume it would eventually. When I try to download it, I get just the home page page with nothing following:
Quote:
Originally Posted by 4788.elf
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4 .01 Transitional//EN"
"http://www .w3.org/TR/html4/loose.dtd">
. <html>
. <head>
<title>factordb .com</title>
<script type="text/javascript" src="ajax .js"></script>
. </head>
<body><table border=0 width="98%"><tr><td width=14% align="center" bgcolor="#BBBBBB"><a href="index .php">Search</a></td>
<td width=14% align="center" bgcolor="#BBBBBB"><a href="sequences .php">Sequences</a></td>
<td width=14% align="center" bgcolor="#BBBBBB"><a href="result .php">Report results</a></td>
<td width=14% align="center" bgcolor="#BBBBBB"><a href="tables .php">Factor tables</a></td>
<td width=14% align="center" bgcolor="#BBBBBB"><a href="status .php">Status</a></td>
<td width=14% align="center" bgcolor="#BBBBBB"><a href="downloads .php">Downloads</a></td>
<td width=14% align="center" bgcolor="#BBBBBB"><a href="login .php">Login</a></td>
</tr></table><br><center><table border=0 width="500"><tr><td align="center" colspan=2 bgcolor="#BBBBBB"><b>Resources used by your IP</b> (<a href="help .php?page=1">?</a>)</td>
. </tr><tr><td align="center" bgcolor="#DDDDDD">Page requests</td>
. <td align="center" bgcolor="#DDDDDD">143</td>
. </tr><tr><td align="center">IDs created</td>
. <td align="center">1</td>
. </tr><tr><td align="center" bgcolor="#DDDDDD">Database queries</td>
. <td align="center" bgcolor="#DDDDDD">1,329,124</td>
. </tr><tr><td align="center">CPU (Wall clock time)</td>
<td align="center">1,733 .0 seconds</td>
. </tr><tr><td align="center" bgcolor="#DDDDDD">Counting since</td>
. <td align="center" bgcolor="#DDDDDD">April 26, 2013, 6:40 am</td>
. </tr></table></center><br><br>
. <center>
. <font size="-1">
factordb .com - 18 queries to generate this page (0.01 seconds) (<a href="res.php">limits</a>) (<a href="imp.html">Imprint</a>)
. </font>
. </center>
. </body>
. </html>
schickel is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Broken aliquot sequences fivemack FactorDB 45 2020-05-16 15:22
Graphs broken for aliquot sequences on factordb fivemack Aliquot Sequences 4 2018-03-23 11:54
Broken sequences / duplicate entries Syd FactorDB 33 2014-03-20 12:33
A new theorem about aliquot sequences garambois Aliquot Sequences 34 2012-06-10 21:53
New article on aliquot sequences schickel mersennewiki 0 2008-12-30 07:07

All times are UTC. The time now is 07:40.

Fri Jul 10 07:40:36 UTC 2020 up 107 days, 5:13, 0 users, load averages: 1.19, 1.28, 1.28

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.