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Old 2014-11-23, 14:26   #2
ATH
Einyen
 
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Dec 2003
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I tested the cofactor of F25, F26 and F27 with Prime95, and they are composite, but it is not "official" until it is tested on another hardware with another software.

Post #51, #62, #64 in this thread:
http://mersenneforum.org/showthread.php?t=12168

Ewmayer is using his own code to test up to F29:
http://www.mersenneforum.org/showthread.php?t=18748
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