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Re: Primes of the form 2^p-p

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  • pminovic
    If you allow not only primes but all odd numbers then besides 3, 13 and 19, 2^p-p (p
    Message 1 of 2 , Sep 7, 2004
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      If you allow not only primes but all odd numbers then
      besides 3, 13 and 19, 2^p-p (p<10,000) is also
      prime for p=9 and 21 and 3-PRP for
      p=55, 261, 3415, 4185, and 7353.

      Furthermore, the "PRP-Records" site lists 4 more PRP's:
      2^108049-108049, 32526 digits
      2^61011-61011,
      2^60975-60975,
      2^44169-44169
      all found by Henri Lifchitz in 2001.

      Predrag
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