John D. Cook johndcook.com

Tritone substitution

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Bitcoin hash rate, mining difficulty, and competition

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Exahash, Zettahash, Yottahash

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10,000,000th Fibonacci number

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Computing big, certified Fibonacci numbers

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Orbital hodograph | Plotting velocity of Keplerian orbit

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Race between primes of the forms 4k + 1 and 4k + 3

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Wagon’s algorithm in Python

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Finding a square root of -1 mod p

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Finding a non-square mod p

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Expressing a prime as the sum of two squares

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Aligning one matrix with another

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Computing large Fibonacci numbers

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Fibonacci numbers and time-space tradeoffs

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Chowla conjecture on the minimum of a cosine series

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Finding all the roots of a polynomial using the QR algorithm

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Fibonacci number certificates

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Gamma function at reciprocals of integers

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Polish serenity

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Satellites have a lot of room

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