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229 and Level 4

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How do we know that 229 is a prime number? If 229 were not a prime number, then it would be divisible by at least one prime number less than or equal to √229 ≈ 15.133. Since 229 cannot be divided evenly by 2, 3, 5, 7, 11, or 13, we know that 229 is a prime number.

Excel file of puzzles and previous week’s factor solutions: 12 Factors 2014-09-08

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