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Old 2019-06-26, 00:16   #5
R. Gerbicz
 
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"Robert Gerbicz"
Oct 2005
Hungary

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W(79) is prime, but W(W(79)) is divisible by 183756724581423634555339057*101874969893105185923314913883, hence it is composite.

ps,
and these has a single google hit: https://www.mersenneforum.org/showpo...11&postcount=5

Last fiddled with by R. Gerbicz on 2019-06-26 at 00:21
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