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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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The largest natural number n such that the sum of the digits of n2 is not smaller than n/2. [Capelle]

 

  Submitted: 2009-09-18 04:54:43;   Last Modified: 2009-09-18 06:37:19.



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