Hi,
Mersenne primes are of the form 2^p-1. The usual generalization is primes of the form ((k^p)-1)/(k-1), that is repprimes in base k. It is a well known result that when
2^p-1 is composite every prime factor has to be of the form 2np+1 for some n. Does there exist a similar restriction for divisors of repdigits? Most results for Mersenne numbers generalize easily but this one doesn't seem to. Any thoughts?
Regards,
Joshua Zelinsky
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