A Multiplication Based Logic Puzzle

113 and Level 5

113  is a prime number. 113 = 1 x 113. Its only factors are 1 and 113. Prime factorization: none.

How do we know that 113 is a prime number? The square root of 113 is an irrational number approximately equal to 10.63. If 113 were not a prime number, then it would be divisible by at least one prime number less than or equal to 10.63. Since 113 cannot be divided evenly by 2, 3, 5, or 7, we know that 113 is a prime number.

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

2014-18 Level 5

Excel file of puzzles and the previous week’s solutions: 12 Factors 2014-05-05

2014-18 Level 5 Logic

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