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Old 2012-04-20, 06:43   #188
schickel
 
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Quote:
Originally Posted by Dubslow View Post
Does he even know that there are errors in the database?
I reported some in mid-February that had errors. I assume he probably saw that post.
Quote:
Perhaps it would help speed up the process if we could compile a list of links to each number which is stored incorrectly, as well as what sequence and line that number occurs at to make flushing the succeeding lines easier (if it doesn't happen automatically).
I think there is some metadata stored for sequences (there's a post in the FactorDB thread somewhere where he talked about dropping an index and rebuilding it to fix sequence errors), something like that would take care of us. Below that, I think he has a script to check the full integrity of each number and its factorization, but I don't know how long it takes to run and whether or not it requires exclusive access or not.
Quote:
For example:
Code:
75402, i2051: http://factordb.com/index.php?id=534062867052540827
  If you refresh it enough times, it will occasionally appear as FF without any factors listed. Line 2502 needs to be recalculated, after this number is fixed.
I thought about starting a reporting thread in the FactorDB forum, but didn't.....
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Old 2012-04-27, 14:36   #189
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I thought the following was fairly interesting. 3 very close values due to a fairly large twin prime and the smallest perfect number.

Its from 1278480

Code:
639 . 799858816619302473118275277197659899244830242353880362391892241816431088334 = 2 * 3 * 133309802769883745519712546199609983207471707058980060398648706969405181389
640 . 799858816619302473118275277197659899244830242353880362391892241816431088346 = 2 * 3 * 133309802769883745519712546199609983207471707058980060398648706969405181391
641 . 799858816619302473118275277197659899244830242353880362391892241816431088358 = 2 * 3^4 * 761 * 22484149900539495426601355003279 * 288560706695245341536872445882282707061
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Old 2012-05-03, 15:31   #190
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my intent was to prove a prp...
Code:
ecm -c 0 -I 3 -pm1 1e6
GMP-ECM 6.4.2 [configured with MPIR 2.5.1] [P-1]
((10^10261*17-53)/117-1)/6786181321342109281057159754389466902690195104791235362
81023370974655782538755407244697801814863543444869917694106309498851317761583170
68103321824866326322285987965460176946277035301962791203854117391535953963443676
17891944265398744331006625410
Input number is ((10^10261*17-53)/117-1)/678618132134210928105715975438946690269
01951047912353628102337097465578253875540724469780181486354344486991769410630949
88513177615831706810332182486632632228598796546017694627703530196279120385411739
153595396344367617891944265398744331006625410 (10017 digits)
Using B1=1000000, B2=1886622346, polynomial x^1, x0=1658312913
Step 1 took 258571ms
********** Factor found in step 1: 736183775266768523893900375053395802969185549
51655966849831359960431422235080541496408420471541729971200601733084494089627298
49378437198833676462908885696598898164282261456345843479014392667128462193581071
407176013873331705151383870773153395169197737
Found composite factor of 250 digits: 736183775266768523893900375053395802969185
54951655966849831359960431422235080541496408420471541729971200601733084494089627
29849378437198833676462908885696598898164282261456345843479014392667128462193581
071407176013873331705151383870773153395169197737
Composite cofactor (((10^10261*17-53)/117-1)/67861813213421092810571597543894669
02690195104791235362810233709746557825387554072446978018148635434448699176941063
09498851317761583170681033218248663263222859879654601769462770353019627912038541
1739153595396344367617891944265398744331006625410)/73618377526676852389390037505
33958029691855495165596684983135996043142223508054149640842047154172997120060173
30844940896272984937843719883367646290888569659889816428226145634584347901439266
7128462193581071407176013873331705151383870773153395169197737 has 9767 digits
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Old 2012-05-03, 20:56   #191
Batalov
 
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1. What does it have to do with aliquots?
2. 10260 = 2 * 2 * 3 * 3 * 3 * 5 * 19, so of course (10^10260-1) has zillions of small factors. It is 35.20% factored, so proof is very easy

Last fiddled with by Batalov on 2012-05-03 at 21:08
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Old 2012-05-14, 05:54   #192
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Well, since we pushed 4788 over 3600 lines, that means that 314718 is now at 11,000_ lines....only the second sequence to achive that mark!
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Old 2012-08-17, 09:07   #193
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Wow! Just noticed this one from fivemack: reserved way back a year ago, 119472 will serve as an inspiration to LaurV:
Code:
 380 .   654702352433694915020223628642043797670553520375330529218431265284942258850788966224056062658369740959788317261748860966077034120 = 2^3 * 3^2 * 5 * 357900440399204822434551219282872874284233697 * 5081350678475424188901179711470674268623940177115332661993165354633542489261829461
 381 .   1473080292975813558795503164444598544758745426789673984557716647905500344834964068712879663473340773939952105321140912522567222800 = 2^4 * 3^2 * 5^2 * 52241115139331 * 432682209368494736440069736227561325042261 * 18102661942937583150461608299215040466766794766017755199741200190181503
That's 340 lines and 119 digits straight up(!).....
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Old 2012-11-16, 05:07   #194
Batalov
 
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Phi(4,2^7658614+1)/2

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Interesting... (701694)
Code:
1368 . 2635632963...60<120> = 2^6 * 5 * 127^2 * ...
Let's see if it will get lucky... NO! One factor packed a 2^5 in it!

Last fiddled with by Batalov on 2012-11-16 at 07:33
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Old 2012-11-16, 05:16   #195
Dubslow
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Quote:
Originally Posted by Batalov View Post
Interesting... (701694)
Code:
1368 . 2635632963...60<120> = 2^6 * 5 * 127^2 * ...
Let's see if it will get lucky...
Is anyone specifically working on that number/sequence?

Has anyone ever escaped the D6 above 100 digits?
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Old 2012-11-16, 10:58   #196
fivemack
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Quote:
Originally Posted by Dubslow View Post
Has anyone ever escaped the D6 above 100 digits?
Yes; 19494 loses 2^6*127 between iterations 1527 and 1529, at 120 digits.

966180 loses 2^6*127 between iterations 2667 and 2669, at 107 digits

Last fiddled with by fivemack on 2012-11-16 at 11:07
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Old 2012-11-29, 18:11   #197
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http://www.factordb.com/sequences.ph...r=2244&to=2246

Code:
2176...=2^3*351761333792801269*25356551767842855735377*3050768335867988943102114407401134146256546294637884878439784097681804298170079324983823302833
1904...=2^18*23*31592049788968711916177574027287172876807461062046384435626327044988312164831828232373474413053383283349194768155648600900453389
        ^^^^
2070...=2^4*7*13*1249*250867*1105339387*410575613031300368528610633240316067333040739426517304279238611570239780248119375461533099612652475877729165957777

Last fiddled with by fivemack on 2012-11-29 at 18:11
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Old 2012-12-01, 20:53   #198
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Phi(4,2^7658614+1)/2

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Lovely
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