The book is now available! 87
(another Prime Pages' Curiosity)
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+ 87 = 3 * 29, and curiously 872 + 32 + 292 and 872 - 32 - 292 are primes. [Luhn]

+ 87 = 22 + 32 + 52 + 72. [Sladcik]

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




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