problem with database

[biwema]

That is a funny one:

Sequence 868194, Index 17:

1 FF 7 (Show) 1031886 = 2 · 33 · 97 · 197  
2 FF 7 (Show) 1296594 = 2 · 33 · 13 · 1847  
3 FF 7 (Show) 1808046 = 2 · 32 · 100447  
4 FF 7 (Show) 2109426 = 2 · 3 · 11 · 31 · 1031  
5 FF 7 (Show) 2646030 = 2 · 3 · 5 · 193 · 457  
6 FF 7 (Show) 3751314 = 2 · 3 · 7 · 89317  
7 FF 7 (Show) 4823214 = 2 · 3 · 11 · 73079  
8 FF 7 (Show) 5700306 = 2 · 3 · 71 · 13381  
9 FF 7 (Show) 5861742 = 2 · 3 · 976957  
10 FF 7 (Show) 5861754 = 2 · 33 · 73 · 1487  
11 FF 7 (Show) 7351686 = 2 · 32 · 408427  
12 FF 7 (Show) 8577006 = 2 · 3 · 1109 · 1289  
13 FF 7 (Show) 8605794 = 2 · 3 · 47 · 30517  
14 FF 7 (Show) 8972574 = 2 · 3 · 13 · 37 · 3109  
15 FF 8 (Show) 10881666 = 2 · 32 · 17 · 43 · 827  
16 FF 8 (Show) 14693598 = 2 · 32 · 349 · 2339  
17 FF 8 (Show) 4153^2-7 = 2 · 32 · 19 · 29 · 37 · 47  
18 FF 8 (Show) 25434198 = 2 · 32 · 19 · 31 · 2399  
19 FF 8 (Show) 34469802 = 2 · 32 · 167 · 11467  
20 FF 8 (Show) 40668534 = 2 · 33 · 587 · 1283  
...

Index 17 says 4153^2-7 instead of 17247402.
The value is the same, but caused trouble when exporting for working on it.

[BigBrother]

Originally Posted by biwema

That is a funny one:

Sequence 868194, Index 17:

...
17 FF 8 (Show) 4153^2-7 = 2 · 32 · 19 · 29 · 37 · 47  
...

Index 17 says 4153^2-7 instead of 17247402.
The value is the same, but caused trouble when exporting for working on it.

I had a similar problem with another number today, also in a aliquot sequence, can't remember which sequence though.

[10metreh]

biwema and BigBrother, that problem is known. The database will recognise seemingly random numbers as being close to squares or something like that. It can even do things like 510522 = 22 + 17#.

[BigBrother]

Originally Posted by 10metreh

biwema and BigBrother, that problem is known. The database will recognise seemingly random numbers as being close to squares or something like that. It can even do things like 510522 = 22 + 17#.

I guess the database is becoming sentient. Let's feed it more factors and see what happens!

10metreh: Shall we give it a Turing Test to find out?

[Greebley]

One of the big reasons for posting all open sequences was due to this - I corrected all of these instances by translating them back into numbers - I also checked for db errors, and removed the partial final line as that causes issue on windows.

The only downside is that a sequence could have been extended since sep 15 when I last downloaded the sequences.

My thought was that it depended how the number was first entered into the db.

[TimSorbet]

Originally Posted by BigBrother

I guess the database is becoming sentient. Let's feed it more factors and see what happens!

10metreh: Shall we give it a Turing Test to find out?

Lets see. (results attached) Hm, not quite yet. Maybe it was just a bit confused by thinking I was asking for a factorization...

[gd_barnes]

Originally Posted by 10metreh

biwema and BigBrother, that problem is known. The database will recognise seemingly random numbers as being close to squares or something like that. It can even do things like 510522 = 22 + 17#.

I have concluded the following: The numbers that it recognizes as "forms" like you describe are not random. It will recognize a number as a form if it was previously entered as a form where it factors 50+ of them at once.

As an example, if you go to the "search" link in the top left corner and type in "17#+n" (without quotes), it will factor all forms from 17#+1 to 17#+51. Subsequent to that, whenever a value from 17#+1 to 17#+51 pops up in one of the sequences, it will show it as a form instead of the number.

I was able to demonstrate this to myself when I saw a perfect square plus 2 that was not recognized as a form but the same perfect square plus 3 was recognized as such. I subsequently did the above and tah-dah, it recognized the perfect square plus 2 as a form.

A person could annoy all of the sequence searchers greatly by doing this for all sorts of random forms for medium-sized numbers, i.e. b^n+c where b<100, n<25, and c<100. If you wanted to be really mean, you could probably factor enough forms so that all numbers < 1M in the sequences showed up as a form of some kind!! lol

The bottom line is that the sequences need to be programmed not to show forms of any type. It's OK for random factoring of numbers but obviously creates a problem with the sequences.


Gary

[rodac]

Hello everyone,

I have a problem to send my .elf files into the Database:

- If I try to copy-paste the files into the text area, the "paste" text is in grey and I cannot execute it;

- the "submit files" area is disactived and does not appear;

- and if I try to send them from the DOS window, I have the error message "wget is not recognized", even I have installed it inside the aliqueit folder.

Thank you if you have any solution...

roger

[TimSorbet]

Originally Posted by rodac

- If I try to copy-paste the files into the text area, the "paste" text is in grey and I cannot execute it;

Are you pasting the files, or the contents of the files? I see no reason why it would gray out the text area when you put stuff in it...(unless you were doing something it's not expecting like pasting the files themselves in)

Originally Posted by rodac

- the "submit files" area is disactived and does not appear;

Indeed it is...I wonder why?

Originally Posted by rodac

- and if I try to send them from the DOS window, I have the error message "wget is not recognized", even I have installed it inside the aliqueit folder.

Huh, strange...try also putting wget.exe in a system path, like C:\Windows\system32\.

If all else fails, post them publicly in a zip or something and someone will find a way to get them in, I'm sure.

[Greebley]

I had to download wget for windows. Wasn't too hard to set up after I did a web search for it. I don't remember if the directory it was in was automatically added to my path - I may have changed my path variable manually.

[rodac]

Originally Posted by Mini-Geek

Are you pasting the files, or the contents of the files? I see no reason why it would gray out the text area when you put stuff in it...(unless you were doing something it's not expecting like pasting the files themselves in)

Indeed it is...I wonder why?

Huh, strange...try also putting wget.exe in a system path, like C:\Windows\system32\.

If all else fails, post them publicly in a zip or something and someone will find a way to get them in, I'm sure.

you have given me the key !

I have opened now my .elf file of sequence 707430 with Wordpad, and then I have pasted the content into the database... Now OK !

When I'.ll have a moment I'll put all my worked sequences !

thanks !