The book is now available! 672
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

The nth Prime Page will now find any of the first 2.623˙1015 primes or π(x) for x up to 1017.

+ 672^672 plus the 672nd prime is prime. [Firoozbakht]

+ The largest 3-digit number whose sum of reciprocals of divisors is prime. [Loungrides]

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