### Today’s Puzzle:

Today in the United States many students will celebrate pi day by eating pie. Today’s puzzle looks a little like a pie that has been cut in half, so I’m calling it pie over two, abbreviated as “π/2”.

Write the numbers 1 to 12 in the first column and again in the top row so that those numbers and the given clues make a multiplication table. Be sure to use logic every step of the way.

### Factors of 1759:

- 1759 is a prime number.
- Prime factorization: 1759 is prime.
- 1759 has no exponents greater than 1 in its prime factorization, so √1759 cannot be simplified.
- The exponent in the prime factorization is 1. Adding one to that exponent we get (1 + 1) = 2. Therefore 1759 has exactly 2 factors.
- The factors of 1759 are outlined with their factor pair partners in the graphic below.

**How do we know that ****1759**** is a prime number?** If 1759 were not a prime number, then it would be divisible by at least one prime number less than or equal to √1759. Since 1759 cannot be divided evenly by 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, or 41, we know that 1759 is a prime number.

### More About the Number 1759:

Like every other odd number, 1759 is the difference of two squares:

880² – 879² = 1759.

OEIS.org informs us that 1759 is only the 17th Eisenstein-Mersenne prime number.

24626: 2×7×1759; member of OEIS A219050: numbers n such that 3^n + 34 is prime #mathematics #maths #math pic.twitter.com/WhLoyArpxV

— Voodooguru (@SeanReeves) September 4, 2016