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

I also don't know, maybe [url=http://snipurl.com/gfgidude]this link[/url] will help?

what would i put into google

[quote=retina;121294]I also don't know, maybe [URL="http://snipurl.com/gfgidude"]this link[/URL] will help?[/quote]
[SIZE=4][COLOR=Red][B]POTTYMOUTH ALERT: THE PAGE LINKED ABOVE CONTAINS SOME VERY STRONG LANGUAGE! CLICK AT YOUR OWN RISK!

[/B][SIZE=2][COLOR=Black]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!:smile:
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i also asked what L means
i saw it on the cunningham tables first and then on other posts

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="Anonymous"]They are abbreviations for thousand, million, billion, etc ...[/quote]Really? So what is 2000L?

is it just 2000 then

[QUOTE=retina;121305]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]The page raised a smile, but if the F word is not strong language, there's not much left that is.

Check out [URL="http://www.leyland.vispa.com/numth/factorization/cunningham/main.htm"]Chez-Leyland.[/URL] What you are looking for are called Aurifeuillean factorizations.

[URL="http://en.wikipedia.org/wiki/1000000000000_%28number%29#1012"]Nice summary [/URL]

[quote=retina;121305]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?[/quote]
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.