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.
Find the stride of the longest skip sequence
Sophie Germain prime
Split a string into chunks of specified length
Is it an Armstrong number?
Relative ratio of "1" in binary number
Not square-free number sequence
Divisible by 6
Stress-Strain Properties - 2
Rule of mixtures (composites) - either bound
Divisible by 13
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