This solver is based on the math puzzle called "Not a Big Difference" by University of Waterloo. -------------------------------------- Original Question: Yago takes a two-digit number and subtracts the product of its digits. He calls the result a Yago Number. He repeats this process with other two-digit numbers to find more Yago Numbers. For example, the product of the digits of 82 is 8 × 2 = 16. Then 82 − 16 = 66, so 66 is a Yago Number. Similarly, the product of the digits of 25 is 2 × 5 = 10. Then 25 − 10 = 15, so 15 is another Yago Number. What are the largest and smallest Yago Numbers that you can find? Justify your answers.
When I was given this question, I just thought a solver would work better than solving the question myself.
