20141123, 13:47  #1 
Dec 2010
2·37 Posts 
Curious about the Suyama test
I understand that the Suyama test is used on Fermat number cofactors to see if they're prime.
What exactly is the Suyama test? How does it work? Is there an equivalent test for generalized Fermat number cofactors? What is the status of the cofactors of F25, F26, F27, F28... Based on the information in the link below, the status of these cofactors is unknown. Is that true? http://www.prothsearch.net/fermat.html 
20141123, 14:26  #2 
Einyen
Dec 2003
Denmark
C68_{16} Posts 
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 
20141123, 21:12  #3  
Einyen
Dec 2003
Denmark
2^{3}·397 Posts 
Regarding the Suyama test:
Quote:
Quote:


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