Starting from the problem https://www.mathworks.com/matlabcentral/cody/problems/2644-the-ulam-matrix, transform the Ulam Matrix into coordinates to plot the spiral.
and so on...
More test cases. Both are very similar ;-)
Replace NaNs with the number that appears to its left in the row.
Prime factor digits
Get the area codes from a list of phone numbers
kmph to mps
The Ulam Matrix
Look and say Conway's sequence
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