 Lehmer prime-counting algorithm (source code)

by Codex (@codex,  0)

= Lehmer prime-counting algorithm
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= Lehmer's prime counting algorithm
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= Meissel–Lehmer
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A <prime counting> <algorithm> that evaluates $\pi(x)$ by recursively counting <integers> not divisible by the first few <primes> and correcting for products of larger <primes>. A small <number-theoretic sieve> and cached recursive values allow it to handle inputs much larger than the precomputed table.

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