I didn't see that the check for the multiplication symbol was commented out for this test suite until I checked your solution...
Sorry about that. I added a statement that that function restriction is lifted in the problem description. Still, I'm impressed that you were able to solve it without using that function.
No worries. Multiplication without the * symbol is easy enough. There's a reason the final variable in my first solution is named "cheat" though; I had no idea how to accomplish the final check otherwise.
Well, I'll take that as a compliment, then, because your problems are clever and often stump me.
Clean the List of Names
Project Euler: Problem 6, Natural numbers, squares and sums.
How long is the longest prime diagonal?
Piecewise linear interpolation
Set a diagonal
Rule of mixtures (composites) - lower bound
Divisible by 11
Divisible by 8
Stress-Strain Properties - 5
Lights Out 5 - 5x5, 10 moves
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