一些好的信息在这里的功能PI（X）。显然，
pi(x) = the number of primes less than x
你可以近似pi（x）
x/(log x - 1)
而
the n-th prime of that list of primes is equal to approximately n(log n)
一些好的信息在这里的功能PI（X）。显然，
pi(x) = the number of primes less than x
你可以近似pi（x）
x/(log x - 1)
而
the n-th prime of that list of primes is equal to approximately n(log n)
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