Pseudo-mathematical gibberings (volume 9a) - Page 7

storflyt32 · 2015-02-01, 02:17

http://factordb.com/index.php?id=1100000000747119026

This one I came across tonight.

The dinner took a little time to finish off, so I let it run.

When continuing the session, I noticed this quite large PRP794 factor.

http://factordb.com/index.php?id=1100000000747133559

Also this one late tonight with a late cup of coffee and a dessert.

storflyt32 · 2015-02-09, 01:18

(2^274177+1) / 3

Composite.

paulunderwood · 2015-02-09, 01:28

Here is a list of PRPs of this form. The last on the list has been proved prime by Tom Wu.

Please tell us when you have a PRP over 10 million bits -- comments such as "is composite" are silly.

storflyt32 · 2015-02-09, 17:21

Thanks for the PRP list.

Since (2^65537+1) has factors 3 and P14 = 13091975735977, but not the (2^114689+1) / 3 in between,
the latter number is also composite.

(2^114689+1) / 3

Composite.

Sorry about that.

But I am really of the opinion that you do find more "factors" by means of factorizing than just doing a PRP test on a larger number which most likely is composite and also takes much more time to compute.

storflyt32 · 2015-02-18, 13:30

Oh, I guess you really don't like me very much.

Tested out the following using WinPFGW (64-bits version):

winpfgw>pfgw64 -q"((10^35041*4-1)/378842763)"
PFGW Version 3.7.7.64BIT.20130722.Win_Dev [GWNUM 27.11]

((10^35041*4-1)/378842763) is composite: RES64: [7F1166706CE487EA] (103.7602s+0.1324s)

Therefore, (10^35041*4-1) should be composite as well of course. There were some factors there a little earlier on, but now they are gone. Possibly I am doing this wrong. I will get back to this a little later instead.

R.D. Silverman · 2015-02-18, 14:07

Quote:

Originally Posted by storflyt32

Oh, I guess you really don't like me very much.

Tested out the following using WinPFGW (64-bits version):

winpfgw>pfgw64 -q"((10^35041*4-1)/378842763)"
PFGW Version 3.7.7.64BIT.20130722.Win_Dev [GWNUM 27.11]

((10^35041*4-1)/378842763) is composite: RES64: [7F1166706CE487EA] (103.7602s+0.1324s)

Therefore, (10^35041*4-1) should be composite as well of course. There were some factors there a little earlier on, but now they are gone. Possibly I am doing this wrong. I will get back to this a little later instead.

What compels you to keep posting clueless drivel?

I do not know you personally, so I neither like nor dislike you.

I am, however, totally contemptuous of your posts.

storflyt32 · 2015-02-28, 07:30

http://factordb.com/index.php?id=1100000000760181579

This number was found by means of factorization.

I did not have the individual numbers in advance.

Definitely there are more of these ones around, but the question becomes which numbers that may have such factors and which way you are able to find them as well.

storflyt32 · 2015-03-06, 12:00

http://factordb.com/index.php?id=1100000000763138602

storflyt32 · 2015-03-09, 19:50

Oh, a couple of more factorizations I have stored away.

I could well upload it, but if so, don't jump your seat.

Because in fact, I was able to find a couple of better ones here.

storflyt32 · 2015-04-17, 12:34

A question for you.

This number

http://factordb.com/index.php?id=1000000000000034560

possibly had a small update to it today.

Compare with this number

http://factordb.com/index.php?id=1100000000775348918

which was a C207 a little while ago.

This number is not that easy to factorize. Still, the answer apparently is known here.

If you are supposed to be proud at what you are able to do, why not have it shown up where it is needed?

Really, this result is an example of trial division being carried out on a given number.

This is being done because processing power has incresead in recent times and what earlier appeared to be prime numbers, now more becomes only factors instead.

Anyway, could finish up this factorization when first at it.

Down to a C104 for this number right now, but need to go out for shopping before continuing here.

Edit: It ran off before finishing up. Redoing it right now.

axn · 2015-04-17, 14:23

Quote:

Originally Posted by storflyt32

This number

http://factordb.com/index.php?id=1000000000000034560

possibly had a small update to it today.

Look again

2015-02-01, 02:17	#67
storflyt32 Feb 2013 2×229 Posts	http://factordb.com/index.php?id=1100000000747119026 This one I came across tonight. The dinner took a little time to finish off, so I let it run. When continuing the session, I noticed this quite large PRP794 factor. http://factordb.com/index.php?id=1100000000747133559 Also this one late tonight with a late cup of coffee and a dessert. Last fiddled with by storflyt32 on 2015-02-01 at 03:14

2015-02-09, 01:28	#69
paulunderwood Sep 2002 Database er0rr E9B₁₆ Posts	Here is a list of PRPs of this form. The last on the list has been proved prime by Tom Wu. Please tell us when you have a PRP over 10 million bits -- comments such as "is composite" are silly. Last fiddled with by paulunderwood on 2015-02-09 at 01:29

2015-02-09, 17:21	#70
storflyt32 Feb 2013 2·229 Posts	Thanks for the PRP list. Since (2^65537+1) has factors 3 and P14 = 13091975735977, but not the (2^114689+1) / 3 in between, the latter number is also composite. (2^114689+1) / 3 Composite. Sorry about that. But I am really of the opinion that you do find more "factors" by means of factorizing than just doing a PRP test on a larger number which most likely is composite and also takes much more time to compute. Last fiddled with by storflyt32 on 2015-02-09 at 17:30

2015-02-18, 13:30	#71
storflyt32 Feb 2013 111001010₂ Posts	Oh, I guess you really don't like me very much. Tested out the following using WinPFGW (64-bits version): winpfgw>pfgw64 -q"((10^350414-1)/378842763)" PFGW Version 3.7.7.64BIT.20130722.Win_Dev [GWNUM 27.11] ((10^350414-1)/378842763) is composite: RES64: [7F1166706CE487EA] (103.7602s+0.1324s) Therefore, (10^350414-1) should be composite as well of course. There were some factors there a little earlier on, but now they are gone. Possibly I am doing this wrong. I will get back to this a little later instead. Last fiddled with by storflyt32 on 2015-02-18 at 13:34*

2015-02-28, 07:30	#73
storflyt32 Feb 2013 712₈ Posts	Factordb number. http://factordb.com/index.php?id=1100000000760181579 This number was found by means of factorization. I did not have the individual numbers in advance. Definitely there are more of these ones around, but the question becomes which numbers that may have such factors and which way you are able to find them as well. Last fiddled with by storflyt32 on 2015-02-28 at 07:44

2015-02-09, 01:18	#68
storflyt32 Feb 2013 2×229 Posts	(2^274177+1) / 3 Composite.

2015-03-06, 12:00	#74
storflyt32 Feb 2013 2·229 Posts	http://factordb.com/index.php?id=1100000000763138602

2015-03-09, 19:50	#75
storflyt32 Feb 2013 2·229 Posts	Oh, a couple of more factorizations I have stored away. I could well upload it, but if so, don't jump your seat. Because in fact, I was able to find a couple of better ones here.

2015-04-17, 12:34	#76
storflyt32 Feb 2013 2×229 Posts	A question for you. This number http://factordb.com/index.php?id=1000000000000034560 possibly had a small update to it today. Compare with this number http://factordb.com/index.php?id=1100000000775348918 which was a C207 a little while ago. This number is not that easy to factorize. Still, the answer apparently is known here. If you are supposed to be proud at what you are able to do, why not have it shown up where it is needed? Really, this result is an example of trial division being carried out on a given number. This is being done because processing power has incresead in recent times and what earlier appeared to be prime numbers, now more becomes only factors instead. Anyway, could finish up this factorization when first at it. Down to a C104 for this number right now, but need to go out for shopping before continuing here. Edit: It ran off before finishing up. Redoing it right now. Last fiddled with by storflyt32 on 2015-04-17 at 13:07

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