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Old 2012-01-29, 22:15   #1
literka's Avatar
Mar 2010

19210 Posts
Default Fermat number F6=18446744073709551617 is a composite number. Proof.

Recently I did something similar for sixth Fermat number F6=18446744073709551617 as I did before for F5.
(see my thread "F5=4294967297 is a product of two integers."). Using elementary methods I proved that 274177 is a factor of F6.
Proof is on my www page
Proof of mentioned thread about F5 is on the web page
My web page contains basic proof (not mine), which inspired me to do this job.
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