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-   -   Known Mersenne factors (https://www.mersenneforum.org/showthread.php?t=18284)

CRGreathouse 2013-06-12 18:14

Known Mersenne factors
 
This is similar to my last question here. Where can I look up known factors of (possibly large) Mersenne numbers? For example, I am interested to know if any factors are known for 2^1277 - 1. I didn't see any on factordb.com but there are probably other resources.

Of course none may be known but I'd like to be a bit more thorough in my checking.

science_man_88 2013-06-12 18:20

[QUOTE=CRGreathouse;343167]This is similar to my last question here. Where can I look up known factors of (possibly large) Mersenne numbers? For example, I am interested to know if any factors are known for 2^1277 - 1. I didn't see any on factordb.com but there are probably other resources.

Of course none may be known but I'd like to be a bit more thorough in my checking.[/QUOTE]

[URL]http://www.mersenne.ca/manyfactors.php[/URL]

may be of help, above 10 factor I'm not sure.

Jayder 2013-06-12 18:54

If you didn't realise it, you can also look up information on that particular exponent: [url]http://www.mersenne.ca/exponent.php?exponentdetails=1277[/url]

philmoore 2013-06-12 19:38

[QUOTE=CRGreathouse;343167]This is similar to my last question here. Where can I look up known factors of (possibly large) Mersenne numbers? For example, I am interested to know if any factors are known for 2^1277 - 1. I didn't see any on factordb.com but there are probably other resources.

Of course none may be known but I'd like to be a bit more thorough in my checking.[/QUOTE]

Check out Will Edgington's site:

[url]http://www.garlic.com/~wedgingt/mersenne.html[/url]

Download mersdata.zip, and you will see factors of completely factored Mersenne numbers in one file and known factors of incompletely factored Mersenne numbers with exponents up to 200,000 in a second file. (He considers a Mersenne number as 2^n - 1 for any n, prime or composite.) It has not been updated in a year, but hopefully should still be useful. Will also has a data-base of factors for larger exponents, and has responded to inquiries about specific exponents in the past.

c10ck3r 2013-06-13 00:50

[URL="http://mersenne.org/report_factors/"]http://mersenne.org/report_factors/ [/URL]

Mr. P-1 2013-06-14 11:44

For unfactored Mersennes you can also see the [url=http://mersenne.org/report_ECM/]amount of ECM done[/url].


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