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Old 2022-06-11, 09:57   #2
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

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How original!

You are in luck - this has been done multiple times. See the summary here - https://mersenneforum.org/showpost.p...4&postcount=39

Also, see simply A123271. Sign of the penultimate term of the Lucas-Lehmer sequence.
Or Wikipedia: https://en.wikipedia.org/wiki/Lucas%...nultimate_term
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