The book is now available! 1616668118999191
(another Prime Pages' Curiosity)
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                                                           161666 8118999191
+ The smallest strobogrammatic prime formed from the concatenation of a pair of 8-digit invertible primes, i.e., (16166681, 18999191). There is another one 16-digit such prime. Can you find it? [Loungrides]

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