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. 
[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. 
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]

[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 database of factors for larger exponents, and has responded to inquiries about specific exponents in the past. 
[URL="http://mersenne.org/report_factors/"]http://mersenne.org/report_factors/ [/URL]

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

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