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83 and Level 1

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This week’s puzzles and last week’s solutions: 12 Factors 2014-04-07

How do we know that 83 is a prime number? If 83 were not a prime number, then it would be divisible by at least one prime number less than or equal to √83 ≈ 9.1. Since 83 cannot be divided evenly by 2, 3, 5, or 7, we know that 83 is a prime number.

83 is never a clue in the FIND THE FACTORS puzzles.

 

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