The purpose is to create a list of prime numbers.
Difficulty Level: easy Time Required: 10 minutes
Here's How:
- List all integers up to the number of your choice, say 20: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
- X off all multiples of 2:
1 2 3
4567891011121314151617181920 - X off all multiples of 3:
1 2 3
4567891011121314151617181920 - This leaves 1 2 3 5 7 11 13 17 19, all of which are prime.
- If your number were larger, you would continue marking off all multiples of the next prime (5) and then the next (7), etc.
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