166

This number is a composite.

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The smallest Smith number that is prime when reversed (661), turned upside down (991), and reversed-then-turned upside down (199). You get the next case by inserting a zero between the digits (10606). [Capelle]

Submitted: 2008-09-13 11:24:17;   Last Modified: 2023-09-06 16:02:23.
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