The book is now available! 19681
(another Prime Pages' Curiosity)
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An emirp that can be expressed with the first two prime numbers: (3^3)^3-2. Note that 19681 becomes a semiprime if turned upside down. [Patterson]


  Submitted: 2003-07-19 10:51:24;   Last Modified: 2008-07-31 19:54:55.

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