The book is now available! 373929373
(another Prime Pages' Curiosity)
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+ 373929373 is the smallest 9-digit bi-truncatable palindromic prime that remains palindromic after each truncation. A bi-truncatable prime remains prime even when both ends are truncated. I.e., 7392937, 39293, 929, and 2 are all primes. [Opao]

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