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Old 2007-12-22, 14:38   #1
themaster
 
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Default Number Abreviations

what do the abreviations 2000L and 2000M mean
i understand what M2000 and P2000 are
are there any other abreviations like this that i should know
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Old 2007-12-22, 18:57   #2
retina
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I also don't know, maybe this link will help?

Last fiddled with by retina on 2007-12-22 at 19:07
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Old 2007-12-22, 19:00   #3
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what would i put into google
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Old 2007-12-22, 20:16   #4
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Quote:
Originally Posted by retina View Post
I also don't know, maybe this link will help?
POTTYMOUTH ALERT: THE PAGE LINKED ABOVE CONTAINS SOME VERY STRONG LANGUAGE! CLICK AT YOUR OWN RISK!

Quick (okay, maybe not so quick) answer to the OP's question: They are abbreviations for thousand, million, billion, etc.; K, M, G, T, P, etc. are abbreviations for "kilo-" "mega-" "giga-" "tera-" and "peta-", respectively, which are prefixes used in things like "gigabyte" (1 billion bytes, actually in the case of bytes it's a little more than a billion, but in all other cases "giga-" means just plain old 1,000,000,000, and etc.). For example, your computer's processor clock speed is probably measured in gigahertz--i.e. billions of hertz. (If you have an older processor it's probably measured in megahertz.)

These prefixes have been sort of generalized for use in prime searching--for example, when dealing with Mersenne, Riesel, and Proth numbers (2^n-1, k*2^n-1, and k*2^n+1 respectively), the "n" value is often referred to with one of the above abbreviations--a common example of this you might see would be "500k", referring to n=500,000; another common prefix for values of n is "M", so if you see 1M, it means n=1,000,000.

Another example of these prefixes is sieving, where the p value (the sieving depth) is often referred to in terms of G (1 billion), T (1 trillion), and P (what comes after trillion?).

A quick little reference:
K = 1,000
M = 1,000,000
G = 1,000,000,000
T = 1,000,000,000,000
P = 1,000,000,000,000,000

Hope this helps!

Last fiddled with by mdettweiler on 2007-12-22 at 20:18
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Old 2007-12-22, 20:24   #5
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i also asked what L means
i saw it on the cunningham tables first and then on other posts
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Old 2007-12-22, 20:28   #6
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Actually the page I linked to doesn't have any strong language at all, it is very tame, but perhaps the URL is ... um ... fun.

Quote:
Originally Posted by Anonymous
They are abbreviations for thousand, million, billion, etc ...
Really? So what is 2000L?
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Old 2007-12-22, 20:32   #7
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is it just 2000 then
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Old 2007-12-22, 21:18   #8
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Quote:
Originally Posted by retina View Post
Actually the page I linked to doesn't have any strong language at all, it is very tame, but perhaps the URL is ... um ... fun.
The page raised a smile, but if the F word is not strong language, there's not much left that is.

Last fiddled with by markr on 2007-12-22 at 21:20
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Old 2007-12-23, 00:59   #9
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Check out Chez-Leyland. What you are looking for are called Aurifeuillean factorizations.
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Old 2007-12-23, 01:04   #10
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Nice summary
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Old 2007-12-23, 01:07   #11
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Quote:
Originally Posted by retina View Post
Actually the page I linked to doesn't have any strong language at all, it is very tame, but perhaps the URL is ... um ... fun.

Really? So what is 2000L?
Actually, the bad language was in the title of the web page (the part that shows up in your browser's titlebar), as well as in the URL.

As for 2000L: Sorry, I have no idea what L is supposed to mean. I don't think it's similar to K, M, G, T, P, E, etc. (unless it's the next thing after E, which I doubt). It might be something completely different.
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