The book is now available! 946
(another Prime Pages' Curiosity)
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+ 946 is the only three-digit number m such that the reversal of concatenation of the first m natural numbers is prime. [Firoozbakht]

+ The largest known number n such that n is the sum of two consecutive primes but not the sum of two sums of two consecutive primes. [Capelle]

(There are 3 curios for this number that have not yet been approved by an editor.)

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