The book is now available! 127
(another Prime Pages' Curiosity)
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There are 127 possible prime U.S. Zip Codes that contain exactly two different digits (from 00002 to 99991). [Gaydos]

 

  Submitted: 2017-06-01 09:06:31;   Last Modified: 2017-06-01 12:57:17.



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