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+ The percentage of positive integers that are prime is 0%. That is, if pi(n) is the number of primes less than n, then as n gets larger and larger, pi(n)/n gets closer and closer to 0 (the limit is 0). [Caldwell]

+ The Prime Meridian is located at 0 degrees longitude. [Rupinski]

+ There are 0 primes p in which 0 == m mod p, where m is another prime. Of course, this is a restatement of the definition of primes. [Nicholson]

+ Zero is non-prime and non-composite.

+ In any ring, for every prime there is another prime which can be added to it to get 0. Discussion of the natural primes, by contrast, does not require knowledge of 0's existence. [Merickel]

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