The book is now available! 107101153249117163363
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                                                     1 0710115324 9117163363
+ 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]




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