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179 and Level 6

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How do we know that 179 is a prime number? If 179 were not a prime number, then it would be divisible by at least one prime number less than or equal to √179 ≈ 13.4. Since 179 cannot be divided evenly by 2, 3, 5, 7, 11, or 13, we know that 179 is a prime number.

Excel file of puzzles and previous week’s factor solutions: 12 Factors 2014-07-14

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