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How rare?

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  • Ali Adams
    How rare is it to have 3 prime numbers concatenated left-to-right or right-to-left and still gives you primes?   And if all primes are additive primes (i.e.
    Message 1 of 3 , Sep 1, 2009
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      How rare is it to have 3 prime numbers concatenated left-to-right or right-to-left and still gives you primes?
       
      And if all primes are additive primes (i.e. having prime digit sums) than how rare that would be?
       
      Example:
      7          with  7=7
      29         with  2+9=11
      139       with  1+3+9=13
      729139  with  7+2+9+1+3+9=31
      139297  with  1+3+9+2+9+7=31
       
      Any rough extimate will be do.
       
      Thank you.
       
      Ali Adams




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