This one required a big change in strategy in my case!
Prime factor digits
Get the area codes from a list of phone numbers
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Area of an Isoceles Triangle
Is it really a 5?
Consecutive Equation Times (of the day)
Lights Out 9 - 5x5, light-only solution? II
Divisible by 2
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