Science
Eratosthenes sift finds primes by elimination
HERE’S THE INTERESTING PART
Over two millennia ago, Eratosthenes realized that finding prime numbers one by one was totally miserable. So he invented a mathematical sieve: you just list all numbers, cross out the multiples of two, then three, and so on. Whatever survives this ruthless numerical elimination game is a prime. It is brute-force arithmetic at its absolute finest.
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