Simple but fun
I'm not sure this would work if there is a 0 in x...
Return the 3n+1 sequence for n
Back to basics 23 - Triangular matrix
The Answer to Life, the Universe, and Everything
Is this triangle right-angled?
Sum the rows
Make an identity matrix whose diagonal elements are 1:n
Replace all odd numbers with NaN
find the 'M'
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