Figuring out what day of the week a certain date is? I made a way to do it in two images and an addition back in uni. Simple, but impresses.
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Well, leaving aside social value, I'm thinking maximum kolmogorov-chaitin entropy you can hold in head or something
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Mine is probably adding two 3-digit numbers. Or maybe multiplying two 2-digit numbers.
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I treated the metal arithmetic parts of IQ tests that way. Used hairy algorithms with look up tables etc. everywhere but fast to do in head.
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I am reminded of Von Neumann summing up a huge series in his head for the 'two bicycles and a fly' puzzle
http://mathworld.wolfram.com/TwoTrainsPuzzle.html …Thanks. Twitter will use this to make your timeline better. UndoUndo
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Not complex but, take a single look at a phone number from contacts & sum the digits. It's tests attention span, memory & computation.
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