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SUBMIT YOUR IDEAMy solution is attached. I did find it funny that the lookup tables were larger than the data...
But this was a fun little use case. I really like the variety in the solutions.
Nice touch @estherb47
Fun Challenge. I like the fact that, like most algorithms that were developed before the wide spread use of computers, it had to be complex enough to catch most errors, and yet simple enough to be completed by hand. Credit cards numbers and SIN numbers here in the Great White North are other examples.
And yes, we're assigned number so that are sins can be tracked. Makes the whole final accounting so much neater than weighing your heart against a feather!
Dan
Here's my solution: