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The nth Prime Page will now find any of the first 2.623˙10^{15} primes or
π(x) for x up to 10^{17}. Just showing those entries submitted by 'Rivera': (Click here to show all) 1683 is the ONLY number N that can be expressed as a sum in exactly N ways using three distinct primes each time (the order of the primes in the sum is irrelevant). [Rivera]
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