1990661

This number is a prime.

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The smallest Cyclops strobogrammatic prime formed by inserting a zero between an emirp and its invertible prime. Note that (199, 661) is the 2nd pair of 3-digit prime rotative twins. [Loungrides]

Submitted: 2016-11-12 19:12:15; Last Modified: 2019-01-04 18:35:46.