This was cool: a very easy problem to specify, but hard (for me, anyway) to solve. Even now, I'm not confident that my gigantic bloated code will solve all possible problems, it just managed the four in the test suite!
I like the reference - it's a good resource.
very nice commented code!
Thank you Alfonso! (They're my comments.)
Well, very nice commented solution and very nice problem as well!
Better bullseye matrix
How long is the longest prime diagonal?
Replace all zeros and NaNs in a matrix with the string 'error'
sum of non-primes
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