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Forum: Math 2002-11-12, 18:07
Replies: 5
Views: 1,238
Posted By svempasnake
Mersenne composite using fibonacci

I hope (a), but I think (b). My fantasy fails when trying to figure out any way of dealing with that number. F(2^13466917 -2) just looks like an astronomically long number to me. :(
Forum: Software 2002-10-10, 21:05
Replies: 4
Views: 1,234
Posted By svempasnake
I believe the estimate is made as described here:...

I believe the estimate is made as described here: Prime95- Help, Math - Lucas-Lehmer details
Forum: Miscellaneous Math 2002-10-09, 23:02
Replies: 16
Views: 1,739
Posted By svempasnake
I like that spirit! I tried my fishing luck in...

I like that spirit! I tried my fishing luck in the waters nearby :

s0=4: s6 .. s10
s0=10: s6.. s9
s0=52: s6..s7

Then my patience and a 1000 digit limit called it a day. (Fishing equipment...
Forum: Miscellaneous Math 2002-10-08, 19:46
Replies: 16
Views: 1,739
Posted By svempasnake
Trying goldbach conjencture with 128

I just noticed when playing with Goldbach conjencture, putting in the number 128 (= 127 + 1), out comes 19, 31, 61 ! :surprised: Familliar figures, right? I guess this is just a funny coincidence....
Forum: Math 2002-10-07, 23:26
Replies: 7
Views: 1,100
Posted By svempasnake
Re: Another BIG number

Hi, sounds like a fun challange helping you finding that out! But I don't know yet how to do that in practice. :( However, I think I can tell that your number is about 1,663,618,948 decimal digits,...
Forum: Software 2002-09-22, 07:27
Replies: 42
Views: 2,594
Posted By svempasnake
Thank you for confirming this! Made me feel...

Thank you for confirming this! Made me feel comfortable posting an extended table/diagram. It's in a new topic in the math group, this thread becoming too long now IMHO. Also the original question...
Forum: Math 2002-09-21, 21:06
Replies: 0
Views: 773
Posted By svempasnake
Statistic for factoring rate compared to "1/n"

Hi, I made a sample statistics about how often factors have been found, compared to Georges 1/n prediction. Earlier I made another post in the software forum for another smaller range. The source...
Forum: Software 2002-09-21, 17:19
Replies: 42
Views: 2,594
Posted By svempasnake
Sorry but I think I have to add some confusion...

Sorry but I think I have to add some confusion here: I was curious to see wheter the original or the truncated one gets into factors.zip. To my surprise neither of these are here. Instead a smaller...
Forum: Software 2002-09-21, 10:11
Replies: 42
Views: 2,594
Posted By svempasnake
Are only TF:s counted in nofactors?

Nope[/quote]On the other hand, I believe we will know this anyway, most of the time! Even better, if nofactors is updated the way I hope and belive, the cases where we can't see if a factor was found...
Forum: Software 2002-09-16, 21:32
Replies: 42
Views: 2,594
Posted By svempasnake
Re: Does the LL test:s factorization save or waste CPU time?

OK, this is a part of what I can get out of it:
------------------------------------------------------
Probability that TF up to n bits will find a factor, under assumption TF already is done up to...
Forum: Software 2002-09-14, 15:19
Replies: 42
Views: 2,594
Posted By svempasnake
Dang! :surprised:ops: Youre right. Thougt I...

Dang! :surprised:ops: Youre right. Thougt I tripplechecked it on a bunch of numbers, but I must have been blind. With 1 it works. Thanks for seeing it!

Ah! I tested now. Yup, it fails after 308...
Forum: Software 2002-09-14, 09:37
Replies: 42
Views: 2,594
Posted By svempasnake
Not quiet :shock: : 2^66 is 7.4e19. The factor...

Not quiet :shock: : 2^66 is 7.4e19. The factor mentioned here is 4.0e19 or 65 bits.

I just noticed this when looking if my implementation of
bits_in_factor := Round_up (log2 (factor))
works as...
Forum: Software 2002-09-13, 15:38
Replies: 9
Views: 1,078
Posted By svempasnake
Re: any body play with the soft fft crossover yes?

Well sorry not yet! I have one in que tho, it's at 15,343,000 running on my PIII. I plan to just use default's. LL will start about Oct.31. Right after that I could tell whether it picked the lower...
Forum: Software 2002-09-11, 15:33
Replies: 42
Views: 2,594
Posted By svempasnake
Thanks for all replies and comments! So in...

Thanks for all replies and comments! So in summary, where I went wrong was when I read 66 too literally as "trial factored to 66 bits". Now I got a better clue about what P-1 actually does. Thanks...
Forum: Software 2002-09-10, 21:08
Replies: 42
Views: 2,594
Posted By svempasnake
Does the LL test:s factorization save or waste CPU time?

Hi, when I run an LL test on an ~16M exponent, the times needed on my home PC are these, roughly:
Factoring up to 66 bits: a bit more than ½ day (maybe something like 14-16 hours)
LL testing: about...
Forum: Software 2002-09-09, 21:32
Replies: 2
Views: 1,163
Posted By svempasnake
Forum: Software 2002-09-09, 20:36
Replies: 2
Views: 1,163
Posted By svempasnake
Can I move an exponent near a FFT crossover to my P III?

Hi, I thougt about fine tuning my contribution a little, this way: I run Prime95 on a P4 at home and on a PIII at work. Two of the exponents currently assigned to my P4 are 12,698,243 and 15,343,519....
Forum: Math 2002-09-06, 14:34
Replies: 31
Views: 2,690
Posted By svempasnake
Re: Some more error numbers

Practically yes :) : In the lucas_v.txt copy I've got, downloaded it about 10 days ago, "DISTINCT EXPONENT" here counts to 131563. /S-O
Forum: Math 2002-08-26, 17:47
Replies: 31
Views: 2,690
Posted By svempasnake
Re: Error Rates

Dear George, thanks for your attention. I think your count is more accurate in one way, mine was semi-manual, based on sorting and counting lines manually. So, for example I was too lazy to count...
Forum: Math 2002-08-26, 15:10
Replies: 31
Views: 2,690
Posted By svempasnake
Re: Error Rates

Sorry, my first "rough counting" was not right. Also chosing 6.0 - 6.5 M was out of topic, since this intervall isn't 100% double checked yet. So please forget that result (2-2.5%).

So I counted...
Forum: Math 2002-08-26, 10:21
Replies: 31
Views: 2,690
Posted By svempasnake
I had a quick look into this, at the exonents...

I had a quick look into this, at the exonents around 6 - 6.5 millions. According to my rough counting, I find the error rate there to be about 2% - 2.5%! Note that the FAQ suggests about 1% error...
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