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Old 2005-12-12, 15:22   #3
alpertron
 
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Aug 2002
Buenos Aires, Argentina

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If you want that all prime factors of the Carmichael number have to be Mersenne numbers, it cannot be of the known form (6k+1)(12k+1)(18k+1), where each factor is prime. But most Carmichael numbers do not have this form.
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