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

101001111102 Posts

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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