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19810Find non-integer A such that floor(A^n) is never prime?

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  • jbrennen
    Jan 15, 2009
      Just a silly little thought I had...




      It is almost certainly possible to find a positive non-integer A > 1
      such that for all integer n, floor(A^n) is not prime.


      Question -- does any such number A exist with a simple closed-form
      expression?

      Or, along those lines... is floor(sqrt(18)^n) ever prime? :)
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