John D. Cook johndcook.com

Logic behind chemical element symbols

johndcook.com·17w·Hacker News

Largest known compositorial prime

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log2(3) and log2(5)

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In-shuffles and out-shuffles

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Perfect and imperfect shuffles

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Knight’s tour with fewest obtuse angles

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Converting between geographic and geocentric latitude

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Klein bottle: from intuition to rigor

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Validating AI output with consistency checks & formal proofs

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When was Newton born?

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Mason, Dixon, and Latitude

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Bowie's ODE solver and the nonlinear pendulum

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Trying to fit exponential data

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The folly of naively fitting a logistic curve

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Regular expressions that cross lines

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Here’s a curious theorem I stumbled across recently \[1\]\. Take an integer *N* which is not a multiple of 10\. Then there is some multiple of *N* which only contains the digits...

johndcook.com·21w

Golden iteration

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Just change the key

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Rolling n-sided dice to get at least n

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Fourier transform of a Fourier series

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