Here’s a puzzle made with some sweet squares. The nine clues in it are all you need to find the factors and complete the entire “mixed-up” multiplication table.

Print the puzzles or type the solution in this excel file: 12 factors 1311-1319

Now I’ll write some facts about the number 1311:

- 1311 is a composite number.
- Prime factorization: 1311 = 3 × 19 × 23
- The exponents in the prime factorization are 1, 1, and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1)(1 + 1) = 2 × 2 × 2 = 8. Therefore 1311 has exactly 8 factors.
- Factors of 1311: 1, 3, 19, 23, 57, 69, 437, 1311
- Factor pairs: 1311 = 1 × 1311, 3 × 437, 19 × 69, or 23 × 57
- 1311 has no square factors that allow its square root to be simplified. √1311≈ 36.20773

1311 is the sum of five consecutive prime numbers:

251 + 257 + 263 + 269 + 271 = 1311