OK. I'll bite. Where did this formula come from?
Just from calculating a number of values and figuring out the pattern.
That's quite the pattern to figure out...
Project Euler: Problem 5, Smallest multiple
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Numbers on 7-segment
Solve The Equation
Get a new matrix by mapping each element of an arbitrary-sized input matrix using lookup table
Find the mean of a 2-D matrix after excluding elements of specified sub-matrix
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