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Palindromic - like primes with digits 3 and 7.

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  • Mark Underwood
    There seems to be an abundance of primes having digits only 3 and 7, and which are also prime when read backwards. (A small subset of these are palindromic.)
    Message 1 of 1 , Nov 13, 2008
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      There seems to be an abundance of primes having digits only 3 and 7, and which are also
      prime when read backwards. (A small subset of these are palindromic.)

      For instance we have

      (37, 73)

      (337, 733) (373)

      (3733, 3373)

      (77377)

      (733333, 333337) (777373, 373777) (737773, 377737)

      (3337333) (7737733, 3377377) (3733333, 3333373) (7777337, 7337777)

      (73773773, 37737737) (77377337, 73377377) (77733377, 77333777)


      That's as far as I went. May have missed some since it was just inspection. Enough to
      make one dizzy. But to me there seems to be a surprisingly high number of these types.


      Mark
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