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Re: Number 19

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  • maximilian_hasler
    ... The 15 digit number 151515151515151 is prime, too ; and it is the only such prime (undulating : aba...ba with ab = 10*a+b or ba = 10*b+a digits. M.
    Message 1 of 5 , Sep 10, 2010
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      > 23 digits 91919191919191919191919 is prime
      > 17 digits 91919191919191919 is prime.
      > 11 digits 91919191919 is prime.
      > 9 digits 919191919 is prime.

      The 15 digit number 151515151515151 is prime, too ;
      and it is the only such prime (undulating : aba...ba
      with ab = 10*a+b or ba = 10*b+a digits.

      M.
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