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283 and Level 6

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How do we know that 283 is a prime number? If 283 were not a prime number, then it would be divisible by at least one prime number less than or equal to √283 ≈ 16.823. Since 283 cannot be divided evenly by 2, 3, 5, 7, 11, or 13, we know that 283 is a prime number.

Print the puzzles or type the factors on this excel file: 10 Factors 2014-10-27

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