very cool question: learn some new tricks, and get 10 points, why not?!
Hint to spare the pain : string(NaN)==
Return the 3n+1 sequence for n
Create matrix of replicated elements
Symmetry of vector
Find a Pythagorean triple
String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
Group-wise Euclidean distance
Block average ignoring NaN values
Fast 1-D Convolution (valid shape)
Hankelize a matrix
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