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Old 2019-04-13, 16:01   #7
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Quote:
Originally Posted by MathDoggy View Post
Counterexample to Lehmer's totient problem
2^521-1 is prime and when you put in the Phi function it is not equal to (2^521-1)-1 as Lehmer conjectured
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