Wolfram Demonstrations Project

To get all the primes up to a certain number

(the largest number in the array), strike out the multiples of the primes less than

These are the numbers taken out: 4, 6, 8, 10, … , 6, 9, 12, 15, … , 10, 15, 20, 25, … , 14, 21, 28, 35, … , and so on.

Contributed by: George Beck

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