The book is now available! 983
(another Prime Pages' Curiosity)
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The smallest nontrivial (multidigit) emirp that is the sum of the first n untouchable numbers (2+5+52+88+...+162+188=983). [Bajpai]

 

  Submitted: 2016-07-21 14:29:18;   Last Modified: 2016-07-21 16:40:50.



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