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The smallest 21-digit emirp that remains an emirp after rightmost digits are omitted three at a time, i.e., 107101153249117163363, 107101153249117163, 107101153249117, 107101153249, 107101153, 107101, 107 are all emirps. [Loungrides]

 

  Submitted: 2017-07-11 09:17:18;   Last Modified: 2017-07-26 06:50:17.



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