The book is now available! 2197
(another Prime Pages' Curiosity)
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+ This is the smallest cube (13^3) that may be obtained by concatenating primes in two different ways: 2, 197 and 2, 19, 7. [Hartley]

+ The smallest cube whose sum of digits is a prime number. [Gudipati]

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

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