It is a simple Algorithm to find prime numbers up to a given number 'N' discovered by an Indian Student Mathematician S.P. Sundaram. More details can be found at
http://en.wikipedia.org/wiki/Sieve_of_Sundaram
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The Sieve of Eratosthenes filters numbers, letting the composites fall through while the primes remain.
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STRAIN - separate solid from liquid to pour food, etc. through something with very small holes in it, for example a SIEVE, in order to separate the solid part from the liquid part. SIFT to remove something that you do not want from a substance by putting it through a SIEVE: E.g.: Put the flour through a sieve to sift out the lumps. SIEVE a tool for separating solids from liquids or larger solids from smaller solids, made of a wire or plastic net attached to a ring.
It was around 200 BC.
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