Factoring database - Page 73

Andi47 · 2010-08-04, 08:57

Quote:

Originally Posted by klajok

[I am not sure if it is right thread for such problem]

At page http://factordb.com/search.php?id=167488215 there is listed number 57 which is obviously factored, but blocks progress of sequence: http://factordb.com/search.php?se=16...&action=last20 , additionally in text mode of the same sequence: http://factordb.com/search.php?se=16...&to=&text=Text there is similarly number 283.

"Repair sequence" doesn't work. Is there any workaround for this issue?

Are you sure about 283? That's actually a prime, so what's the problem with this one?

EdH · 2010-08-04, 13:42

Quote:

Originally Posted by klajok

[I am not sure if it is right thread for such problem]

At page http://factordb.com/search.php?id=167488215 there is listed number 57 which is obviously factored, but blocks progress of sequence: http://factordb.com/search.php?se=16...&action=last20 , additionally in text mode of the same sequence: http://factordb.com/search.php?se=16...&to=&text=Text there is similarly number 283.

"Repair sequence" doesn't work. Is there any workaround for this issue?

This is the correct thread. We've been waiting for a fix for the 57 "bug" for a few months now (as well as other anomalies).

The "text mode" issue is still the 57 "bug," not something about the 283. The 57 just isn't shown in iteration 43 because it is considered "unfactored." See:

Code:

Sequence ended: not all factors known
            Unfactored: 57
               at n=43

in the center of the page.

The "workaround" is to start a new sequence in the db using the correct composite value for iteration 44. When the 57 "bug" gets repaired, the sequence will correct itself based on matching the correct values for iteration 44.

Andi47 · 2010-08-04, 15:12

Quote:

Originally Posted by EdH

When the 57 "bug" gets repaired...

if ever...

firejuggler · 2010-08-04, 16:25

do ve have a list of those numbers?
i know there is 52,57 ,155,159,175,634... is there any other?
edit, found another one
1111536

kar_bon · 2010-08-04, 16:31

Quote:

Originally Posted by firejuggler

do ve have a list of those numbers?
i know there is 57 ,159,175... is there any other?

Batalov gave a list in post #767!

Andi47 · 2010-08-05, 00:45

Quote:

Originally Posted by Andi47

Hmmm... this is different to the email adress which I have (i had some email contact with him in spring).

I have sent an email to him before you have posted (via the email function in mersenneforum). If I get no answer in the next few days, I will try the address given in the FactorDB.

I just got an answer from Syd via email: He is currently completely rewriting the DB; he says that approx. 80% are done.

henryzz · 2010-08-05, 08:02

Quote:

Originally Posted by Andi47

I just got an answer from Syd via email: He is currently completely rewriting the DB; he says that approx. 80% are done.

Some communication might be nice but at least it is happening.

ET_ · 2010-08-05, 11:20

Quote:

Originally Posted by Andi47

I just got an answer from Syd via email: He is currently completely rewriting the DB; he says that approx. 80% are done.

Luigi

wreck · 2010-08-05, 12:05

Quote:

Originally Posted by firejuggler

do ve have a list of those numbers?
i know there is 52,57 ,155,159,175,634... is there any other?
edit, found another one
1111536

I am curious why these numbers thought to be unfactored.
The first six numbers all have two diffrent prime factors, but 1111536 have four different prime factors.

firejuggler · 2010-08-05, 17:08

from what I know, there was a time when you could qualify any number as prime even if they werent. Maybe it is a consequence of that of that (see http://factordb.com/search.php?se=1&...&action=last20 for an 'even' last term of 107 digits)

kar_bon · 2010-08-05, 17:14

Quote:

Originally Posted by firejuggler

from what I know, there was a time when you could qualify any number as prime even if they werent. Maybe it is a consequence of that of that (see http://factordb.com/search.php?se=1&...&action=last20 for an 'even' last term of 107 digits)

Not really, those 'small' numbers here are rated as 'C' -> composite not prime!

Here are some more (up to n=40000 complete):

Code:

52   = 2^2*13
57   = 3*19
155  = 5*31
159  = 3*53
175  = 5*5*7
634  = 2*317
1402 = 2*701
2354 = 2*11*107
4330 = 2*5*433
5034 = 2*3*839
7773 = 3*2591
9530 = 2*5*953
22274= 2*7*37*43
30031= 59*509
30518= 2*15259
32234= 2*71*227
34808= 2^3*19*229
(...)
1111536 = 2^4*3^3*31*83

2010-08-04, 16:25	#796
firejuggler Apr 2010 Over the rainbow 5056₈ Posts	do ve have a list of those numbers? i know there is 52,57 ,155,159,175,634... is there any other? edit, found another one 1111536 Last fiddled with by firejuggler on 2010-08-04 at 16:43

2010-08-05, 17:08	#802
firejuggler Apr 2010 Over the rainbow 2·1,303 Posts	from what I know, there was a time when you could qualify any number as prime even if they werent. Maybe it is a consequence of that of that (see http://factordb.com/search.php?se=1&...&action=last20 for an 'even' last term of 107 digits) Last fiddled with by firejuggler on 2010-08-05 at 17:11

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