sieve of Eratosthenes

sieve of Eratosthenes

noun Mathematics.
a method of obtaining prime numbers by sifting out the composite numbers from the set of natural numbers so that only prime numbers remain.

Origin:
1795–1805
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sieve of Eratosthenes is always a great word to know.
So is perfect number. Does it mean:
a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios
a positive number that is equal to the sum of all positive integers that are submultiples of it, as 6, which is equal to the sum of 1, 2, and 3
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