Weekly Challenges
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Did this in a different way - using mod math & exponents rather than text manipulation - gets a bit messy when you deal with floating point numbers tho...
I must admit - now that I see other people's solutions - I'm a bit jealous of the elegance of @Aaron_Harter 's or @atcodedog05 ; @etzele ; @jeng ; @Kenda 's solution with text and regex
