The book is now available! 2861
(another Prime Pages' Curiosity)
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+ 7777/2861 is the fraction with the smallest prime denominator closer to e than 1650/607.

+ The largest known prime number that cannot be expressed as the sum of 3 pentagonal numbers. [Capelle]

+ The smallest prime which prefixed by the concatenation of two perfect numbers. [Firoozbakht]

+ Magnus Carlsen's peak rating is 2861, the highest in chess history.

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

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