Predict M48... - Page 22

davieddy · 2011-07-02, 04:23

Quote:

Originally Posted by Christenson

It would greatly help that close relationship if you weren't raising your points while I was composing the previous answer.....

And we are missing a link to a classic Beatles song about getting by with a little help from my friends....

And, if anyone has a day or three to wait, I have no problem doing a little more special purpose TF, although it's not on the world's hottest GPU.

That is the inevitable consequence of a snappy exchange of emails!

I know styles vary on this, but I almost invariably quote all or part of
an email I am responding to, even if the original is likely to directly
precede it:
1) It is clearer for third parties to interpret.
2) If someone else posts in between, it looks as if you have ignored them,
even though you had no such intention.

Hmmm. If you remember the Beatles, you weren't there!

I've never quite seen the point of "teams", but if any GPU owner
wanted to assist LL progress as directly as possible with extra TF,
(s)he could do worse than enlist say 50 LL testing CPU owners.
I didn't wait 3 days, but would have been pleased to be informed
had you found a factor nonetheless.
David

davieddy · 2011-07-02, 05:11

Quote:

Originally Posted by davieddy

That is the inevitable consequence of a snappy exchange of emails!

Back in '69, I was corresponding with a Parisian girlfriend.
Letters took ~3 days to deliver. When you both send letters
every 3 days, you get used to the inevitable lag in response.

You also need to have confidence about being on the same wavelength:
e.g. you don't want to have written "I love you" at the same time as she
is writing "You're Chucked"!

David

davieddy · 2011-07-02, 05:55

Quote:

Originally Posted by davieddy

*Not sure whether anyone in the US knows how
pronounce a short "A" anymore.

PS "Jesus rode into somewhere (Jerusalem?) on an arse".
Doesn't sound right to me.

Come to think of it, they can't pronounce a long one either.

An irritating nasal dipthong (is that the right word?) seems to do for either.
(Obama excepted).
David (Oxbridge/West London snob

)

On reconsideration, I didn't mean short and long "A".
I think you colonials can say "Hay" okay.
It is the relevance or otherwise of the "r" that is in question.
And possibly the double "s". Zed Zed Top

LiquidNitrogen · 2011-07-03, 19:29

Mine is 49,291,591.

davieddy · 2011-07-03, 19:36

Quote:

Originally Posted by LiquidNitrogen

Mine is 49,291,591.

My guess is that you are testing it ATM
See the "Predict M48" thread in the lounge.

LiquidHelium.

KingKurly · 2011-07-03, 19:58

Quote:

Originally Posted by LiquidNitrogen

Mine is 49,291,591.

Bad guess; that exponent has already been factored; M49291591 is divisible by 219347579951 (k = 2225 = 5*5*89)

http://mersenne.org/report_exponent/?exp_lo=49291591

LiquidNitrogen · 2011-07-03, 22:00

Quote:

Originally Posted by davieddy

My guess is that you are testing it ATM

Nope, I am working on M46789177 which has no prime factors below 2^68th.

davieddy · 2011-07-03, 22:08

Quote:

Originally Posted by LiquidNitrogen

Nope, I am working on M46789177 which has no prime factors below 2^68th.

Me M45xxxxxx. No factors < 2^74. And some P-1 done.

David

LiquidNitrogen · 2011-07-03, 22:18

Quote:

Originally Posted by KingKurly

Bad guess

I change my guess then :)

LiquidNitrogen · 2011-07-03, 22:33

Quote:

Originally Posted by davieddy

And some P-1 done.

And what does P-1 refer to?

Christenson · 2011-07-03, 22:42

P-1 is a factoring method that depends on the fact that mersenne numbers are one different than an even power of two. It has a larger and different feasible search space for factors than TF...but it doesn't have the big speedup on CUDA that TF does. Have a look at the math page.

Do you want me to feed M46789177 to mfaktc for 68 to 71 bits? It would start sometime tomorrow, GMT-4=E. Coast US time.

2011-07-03, 19:29	#235
LiquidNitrogen Jun 2011 Henlopen Acres, Delaware 7·19 Posts	What's your exponent guess for M48? Mine is 49,291,591.

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2011-07-03, 22:42	#242
Christenson Dec 2010 Monticello 703₁₆ Posts	P-1 is a factoring method that depends on the fact that mersenne numbers are one different than an even power of two. It has a larger and different feasible search space for factors than TF...but it doesn't have the big speedup on CUDA that TF does. Have a look at the math page. Do you want me to feed M46789177 to mfaktc for 68 to 71 bits? It would start sometime tomorrow, GMT-4=E. Coast US time.