The book is now available! 623
(another Prime Pages' Curiosity)
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+ 6^6*2^2/3^3-1 and 6^6/2^2*3^3-1 are primes. [Firoozbakht]

+ 623-6*2*3 and 623+6*2*3 are primes. [Firoozbakht]

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