Factoring database - Page 96

bchaffin · 2011-03-07, 04:03

In addition, there seem to be some errors in some of the existing sequences. For example, 390992.744 shows up as:

2^3 · 7 · 1805225369...<98>

Where the 98-digit cofactor is actually composite. The following terms of the sequence are still correct, but the factorizations are not.

lorgix · 2011-03-07, 17:31

Another power outage?

We should start a fund raiser and donate a decent UPS system to Syd..

mataje · 2011-03-07, 18:34

The first numbers of Smallest probable primes are wrong with certificates:
2^1156-293<348> 2^1156-399<348> 2^1158-681<349> 2^1410-41<425> 2^1416-203<427> 2^1416-587<427> 2^1416-117<427> 2288091351...<445> 2^1668-453<503> 2^1668-23<503> 2^1820-663<548>

Syd · 2011-03-08, 20:40

Maybe the sequence cache is not up to date anymore .. I'll delete it and let it rebuild. Hope that will fix it.

@mataje

whats wrong with these PRP's?

mataje · 2011-03-08, 23:22

Hi Syd: The 445 digits is proven by certificate (Ignacio Santos) and for the others I have send certificates.

schickel · 2011-03-09, 07:41

Quote:

Originally Posted by Syd

Maybe the sequence cache is not up to date anymore .. I'll delete it and let it rebuild. Hope that will fix it.

That may have done it. I checked 282810 and the status looks OK. I'll download one of the problem sequences and check the integrity.

Fantastic work on the DB!

bchaffin · 2011-03-10, 19:19

Quote:

Originally Posted by schickel

That may have done it. I checked 282810 and the status looks OK. I'll download one of the problem sequences and check the integrity.

Fantastic work on the DB!

Yep, everything looks clean now. In addition, the error I reported in this post is also fixed (maybe a while ago).

Syd, let me add my thanks to the many others already posted here for all your work on creating and maintaining the DB. It's a fantastic resource and I've really enjoyed getting involved in the sequences -- it wouldn't be nearly as fun or interesting without your central repository for results.

kar_bon · 2011-03-18, 11:53

Tha FactorDB seems to have problems with the HomePrime base 10 sequence:

For example for n=363 the FactorDB ends in a prime although the correct value is open ended (compare with mersennewiki for single indices).

I've informed Syd.
I've not yet checked other bases (2 or 6 on my page) with the FactorDB.
Furthermore it's not clear if other types of sequences affected, too (aliquot, etc.).

Thanks Mathew Steine for the hint.

Syd · 2011-03-18, 13:01

Thanks you schickel and bchaffin and everyone else for helping!

I think I found & fixed the HP-bug. Sometimes small factors were not sorted correctly, causing a wrong next index. But we'll see ..

kar_bon · 2011-03-18, 13:12

Quote:

Originally Posted by Syd

I think I found & fixed the HP-bug. Sometimes small factors were not sorted correctly, causing a wrong next index. But we'll see ..

The erroneous HP10-cases I found are correct now!

Thanks Markus.

lorgix · 2011-03-20, 13:21

What's this?

2011-03-18, 11:53	#1053
kar_bon Mar 2006 Germany 2²·727 Posts	Tha FactorDB seems to have problems with the HomePrime base 10 sequence: For example for n=363 the FactorDB ends in a prime although the correct value is open ended (compare with mersennewiki for single indices). I've informed Syd. I've not yet checked other bases (2 or 6 on my page) with the FactorDB. Furthermore it's not clear if other types of sequences affected, too (aliquot, etc.). Thanks Mathew Steine for the hint. Last fiddled with by kar_bon on 2011-03-18 at 11:54

2011-03-20, 13:21	#1056
lorgix Sep 2010 Scandinavia 3·5·41 Posts	What's this? Attached Thumbnails

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2011-03-07, 04:03	#1046
bchaffin Sep 2010 Portland, OR 2²×3×31 Posts	In addition, there seem to be some errors in some of the existing sequences. For example, 390992.744 shows up as: 2^3 · 7 · 1805225369...<98> Where the 98-digit cofactor is actually composite. The following terms of the sequence are still correct, but the factorizations are not.

2011-03-07, 17:31	#1047
lorgix Sep 2010 Scandinavia 3×5×41 Posts	Another power outage? We should start a fund raiser and donate a decent UPS system to Syd..

2011-03-07, 18:34	#1048
mataje Jan 2009 Bilbao, Spain 433₈ Posts	The first numbers of Smallest probable primes are wrong with certificates: 2^1156-293<348> 2^1156-399<348> 2^1158-681<349> 2^1410-41<425> 2^1416-203<427> 2^1416-587<427> 2^1416-117<427> 2288091351...<445> 2^1668-453<503> 2^1668-23<503> 2^1820-663<548>

2011-03-08, 20:40	#1049
Syd Sep 2008 Krefeld, Germany 230₁₀ Posts	Maybe the sequence cache is not up to date anymore .. I'll delete it and let it rebuild. Hope that will fix it. @mataje whats wrong with these PRP's?

2011-03-08, 23:22	#1050
mataje Jan 2009 Bilbao, Spain 283 Posts	Hi Syd: The 445 digits is proven by certificate (Ignacio Santos) and for the others I have send certificates.

2011-03-18, 13:01	#1054
Syd Sep 2008 Krefeld, Germany 2·5·23 Posts	Thanks you schickel and bchaffin and everyone else for helping! I think I found & fixed the HP-bug. Sometimes small factors were not sorted correctly, causing a wrong next index. But we'll see ..