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Palindromic prime pi(n) of palindromic prime n

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  • Zak Seidov
    For n up to 3,000,000, there are only 3 cases of palindromic prime pi(n) of palindromic prime n: n=3,5,11, with pi(n)=2,3,5. Can anyone find other cases?
    Message 1 of 2 , Feb 2, 2005
      For n up to 3,000,000,
      there are only 3 cases of
      palindromic prime pi(n) of palindromic prime n:
      n=3,5,11, with pi(n)=2,3,5.
      Can anyone find other cases?
      Thanks,
      Zak
      Please email me:
      seidovzf@...
    • Jens Kruse Andersen
      ... b) in http://www.primepuzzles.net/puzzles/puzz_051.htm asks for the next. It reports exhaustive searching found 3 cases with palindromic composite pi(n):
      Message 2 of 2 , Feb 2, 2005
        Zak Seidov wrote:

        > For n up to 3,000,000,
        > there are only 3 cases of
        > palindromic prime pi(n) of palindromic prime n:
        > n=3,5,11, with pi(n)=2,3,5.
        > Can anyone find other cases?

        b) in http://www.primepuzzles.net/puzzles/puzz_051.htm asks for the next.
        It reports exhaustive searching found 3 cases with palindromic composite
        pi(n):
        pi(11) = 5
        pi(143787341) = 8114118
        pi(11853735811) = 535252535 (found by Giovanni Resta)

        --
        Jens Kruse Andersen
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