Factoring database - Page 66

Mini-Geek · 2010-03-04, 14:10

Quote:

Originally Posted by fivemack

Is there a nicer way of doing

(((x + (1-(0-1)^x)/2))/2)!+(0-1)^x

to get $x! \pm 1$ ?

I don't suppose this is acceptable?
x!-1 and x!+1

richs · 2010-03-05, 21:05

The problem with 159 noted above is now happening with the number 57. The database has 57 listed as "C" (composite with no known factors) even though it already knows it's 3*19. If Syd can fix this one too, it would be most appreciated!

Batalov · 2010-03-06, 06:32

((n-n%2)/2)!-(0-1)^n

fivemack · 2010-03-06, 12:00

Oh, that's much neater: thanks!

10metreh · 2010-03-06, 13:51

It's not just 57 and 159. 52, 175, 1402 and 32234 have this new problem too.

10metreh · 2010-03-06, 19:41

It's getting really serious now. The last indices of aliquot sequences 276 and 552 have been set as composite with no known factors despite all the factors being there. I think this can only be a hacker - there is no other reason to pick those numbers.

Batalov · 2010-03-06, 20:23

...and seq 4788, as well.

P.S. I just tried an antidote. You go to the number's factorization as raw (example) and paste this into the factorization results window. It helps.

axn · 2010-03-06, 23:44

Quote:

Originally Posted by axn

Done. Next time, just pick a large (>100000) factor of the number and resubmit. That'll change the status from CF to FF.

Quote:

Originally Posted by 10metreh

I think this can only be a hacker - there is no other reason to pick those numbers.

I think you're overestimating the robustness of the db. I've seen this and a lot worse for many sequences, and no reason to suspect any "hackers".

PS:- Fixed those two sequences. If someone can download them and do an integrity check with aliqueit, I'd appreciate it.

henryzz · 2010-03-07, 08:00

I have just fixed 804192. It needs the original file reuploading as well. I know that this one appeared like this after i submitted my work.

smh · 2010-03-07, 09:42

I don't see a way to fix 943668.

Line 1483 doesn't even have 155 as a factor

richs · 2010-03-07, 15:28

I tried the antidote for HP5 of 679 and 685 to correct the factorizations of 57 and 159, but it did not work.

2010-03-06, 06:32	#718
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9497₁₀ Posts	shrtr? ((n-n%2)/2)!-(0-1)^n

2010-03-06, 13:51	#720
10metreh Nov 2008 2322₁₀ Posts	It's not just 57 and 159. 52, 175, 1402 and 32234 have this new problem too. Last fiddled with by 10metreh on 2010-03-06 at 13:55

2010-03-06, 19:41	#721
10metreh Nov 2008 2×3³×43 Posts	It's getting really serious now. The last indices of aliquot sequences 276 and 552 have been set as composite with no known factors despite all the factors being there. I think this can only be a hacker - there is no other reason to pick those numbers. Last fiddled with by 10metreh on 2010-03-06 at 19:43

2010-03-06, 20:23	#722
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9,497 Posts	...and seq 4788, as well. P.S. I just tried an antidote. You go to the number's factorization as raw (example) and paste this into the factorization results window. It helps. Last fiddled with by Batalov on 2010-03-06 at 20:26 Reason: antidote

2010-03-07, 08:00	#724
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2·3³·109 Posts	I have just fixed 804192. It needs the original file reuploading as well. I know that this one appeared like this after i submitted my work. Last fiddled with by henryzz on 2010-03-07 at 08:00

2010-03-05, 21:05	#717
richs "Rich" Aug 2002 Benicia, California 528₁₆ Posts	The problem with 159 noted above is now happening with the number 57. The database has 57 listed as "C" (composite with no known factors) even though it already knows it's 3*19. If Syd can fix this one too, it would be most appreciated!

2010-03-06, 12:00	#719
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 1100100011000₂ Posts	Oh, that's much neater: thanks!

2010-03-07, 09:42	#725
smh "Sander" Oct 2002 52.345322,5.52471 29×41 Posts	I don't see a way to fix 943668. Line 1483 doesn't even have 155 as a factor

2010-03-07, 15:28	#726
richs "Rich" Aug 2002 Benicia, California 1320₁₀ Posts	I tried the antidote for HP5 of 679 and 685 to correct the factorizations of 57 and 159, but it did not work.

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