Find the peak 3n+1 sequence value
Find the sum of the elements in the "second" diagonal
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Getting the indices from a vector
Check that number is whole number
Don't Try, give up and return NaN.
Best Problem Elections
Modify subscripts - easier
Arithmetic/geometric sequence, 50/50
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