The book is now available! 5
(another Prime Pages' Curiosity)
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The nth Prime Page will now find any of the first 2.623˙1015 primes or π(x) for x up to 1017.

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!5 - 1 is prime. Note that !5 represents subfactorial 5. [Gupta]


  Submitted: 2004-02-01 05:55:23;   Last Modified: 2011-08-01 12:35:03.

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