The book is now available! 146
(another Prime Pages' Curiosity)
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+ The absolute difference between any two digits of 146 is always prime. [Russo]

+ The reversal of 146 is prime and divides the fifth Fermat number.

+ The smallest Untouchable number which is a semiprime. [Gupta]

(There is one curio for this number that has not yet been approved by an editor.)

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