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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Every positive integer can be written as the sum of 5 pentagonal numbers. Note that 5 is the only prime pentagonal number. [Capelle]


  Submitted: 2009-07-12 01:47:30;   Last Modified: 2009-07-12 14:08:22.

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