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May 16, 2017 at 22:39 history edited Stefan Kohl CC BY-SA 3.0
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Apr 13, 2012 at 14:16 history edited A.L CC BY-SA 3.0
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Apr 6, 2012 at 19:13 answer added Zack Wolske timeline score: 2
Apr 6, 2012 at 18:25 comment added Zack Wolske The condition "for every prime $q$ dividing $n$, $q^2$ also divides $n$" is called being powerful in the literature. So after dividing out the factors of $2$, you'd like to know if $2^{p-1} - 1$ is ever powerful when $2^p - 1$ is prime. Ribenboim has some conjectures related to similar questions in "The New Book Of Prime Number Records", in the section on Wieferich primes.
Apr 6, 2012 at 15:45 history edited A.L CC BY-SA 3.0
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Apr 6, 2012 at 15:37 answer added Philip van Reeuwijk timeline score: 3
Apr 6, 2012 at 14:30 history asked A.L CC BY-SA 3.0