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Old 2013-06-12, 18:14   #1
CRGreathouse
 
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Default 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.
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Old 2013-06-12, 18:20   #2
science_man_88
 
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Quote:
Originally Posted by CRGreathouse View Post
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.
http://www.mersenne.ca/manyfactors.php

may be of help, above 10 factor I'm not sure.
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Old 2013-06-12, 18:54   #3
Jayder
 
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If you didn't realise it, you can also look up information on that particular exponent: http://www.mersenne.ca/exponent.php?...ntdetails=1277
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Old 2013-06-12, 19:38   #4
philmoore
 
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Quote:
Originally Posted by CRGreathouse View Post
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.
Check out Will Edgington's site:

http://www.garlic.com/~wedgingt/mersenne.html

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.
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Old 2013-06-13, 00:50   #5
c10ck3r
 
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http://mersenne.org/report_factors/
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Old 2013-06-14, 11:44   #6
Mr. P-1
 
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For unfactored Mersennes you can also see the amount of ECM done.
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