The book is now available! 86269
(another Prime Pages' Curiosity)
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Replace any single digit of 86269 with a 3 and the result is always prime. It is the largest five-digit prime with this property. [Luhn]

 

  Submitted: 2001-01-30 06:28:32;   Last Modified: 2008-01-30 11:19:29.



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