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What is the algorithm and flowchart for finding the prime numbers between 1 and 20?
Wiki User
∙ 6y ago
The algorithm is fairly straightforward. For any integer i greater than or equal to zero:
- i is non-prime if i is less than 2.
- otherwise, i is prime if i is 2.
- otherwise, i is non-prime if i is greater than 2 but is divisible by 2.
- otherwise, i is non-prime if it has any prime factors less than or equal to its square root.
- otherwise, i is prime.
Step 4 is easier to implement by testing all odd divisors from 3 to the square root of i.
Wiki User
∙ 6y ago
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