The common factors of 30 and 48 are 1, 2, 3, and 6. The rules of a Find the Factors 1 – 12 puzzle require that only numbers from 1 to 12 go in either the first column or the top row. Each number can be used only once in each place. Which common factor of 30 and 48 must be chosen?

Here are some facts about the number 1139:

- 1139 is a composite number.
- Prime factorization: 1139 = 17 × 67
- The exponents in the prime factorization are 1 and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1) = 2 × 2 = 4. Therefore 1139 has exactly 4 factors.
- Factors of 1139: 1, 17, 67, 1139
- Factor pairs: 1139 = 1 × 1139 or 17 × 67
- 1139 has no square factors that allow its square root to be simplified. √1139 ≈ 33.74907

1139 is the sum of seven/eleven consecutive primes:

149 + 151 + 157 + 163 + 167 + 173 + 179 = 1139

79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131 = 1139

1139 is the hypotenuse of a Pythagorean triple:

536-1005-1139 which is (8-15-**17**) times **67**