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 ;-)
Determine if a Given Number is a Triangle Number
First non-zero element in each column
convert matrix to single column
Side of a rhombus
Look and say Conway's sequence
The Ulam Matrix
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