The book is now available! 5381
(another Prime Pages' Curiosity)
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+ A term in a decreasing sequence of primes leading to the first prime number, involving the recursive use of the prime counting function: pi(5381) = 709, pi(709) = 127, ... , pi(3) = 2.

+ This prime can be expressed as the sum of squares of five consecutive primes, starting with 23. [Patterson]

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