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 ;-)
Extract leading non-zero digit
Better bullseye matrix
Find nearest prime number less than input number
The Ulam Matrix
Look and say Conway's sequence
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