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  2. List of Martin Gardner Mathematical Games columns - Wikipedia

    en.wikipedia.org/wiki/List_of_Martin_Gardner...

    Sim, Chomp and Race Track: new games for the intellect (and not for Lady Luck) 1973 Feb: Up-and-down elevator games and Piet Hein's mechanical puzzles: 1973 Mar: The calculating rods of John Napier, the eccentric father of the logarithm 1973 Apr: How to turn a chessboard into a computer and to calculate with negabinary numbers 1973 May

  3. List of spirals - Wikipedia

    en.wikipedia.org/wiki/List_of_spirals

    For <, spiral-ring pattern; =, regular spiral; >, loose spiral. R is the distance of spiral starting point (0, R) to the center. R is the distance of spiral starting point (0, R) to the center. The calculated x and y have to be rotated backward by ( − θ {\displaystyle -\theta } ) for plotting.

  4. Golden spiral - Wikipedia

    en.wikipedia.org/wiki/Golden_spiral

    A Fibonacci spiral approximates the golden spiral using quarter-circle arcs inscribed in squares derived from the Fibonacci sequence. A golden spiral with initial radius 1 is the locus of points of polar coordinates ( r , θ ) {\displaystyle (r,\theta )} satisfying r = φ 2 θ / π , {\displaystyle r=\varphi ^{2\theta /\pi },} where φ ...

  5. Logarithmic spiral - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_spiral

    The golden spiral is a logarithmic spiral that grows outward by a factor of the golden ratio for every 90 degrees of rotation (pitch angle about 17.03239 degrees). It can be approximated by a "Fibonacci spiral", made of a sequence of quarter circles with radii proportional to Fibonacci numbers.

  6. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    Both the Fibonacci sequence and the sequence of Lucas numbers can be used to generate approximate forms of the golden spiral (which is a special form of a logarithmic spiral) using quarter-circles with radii from these sequences, differing only slightly from the true golden logarithmic spiral. Fibonacci spiral is generally the term used for ...

  7. Fibonacci nim - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_nim

    Fibonacci nim is played with a pile of coins. The number of coins in this pile, 21, is a Fibonacci number, so a game starting with this pile and played optimally will be won by the second player. Fibonacci nim is a mathematical subtraction game, a variant of the game of nim. Players alternate removing coins from a pile, on each move taking at ...

  8. Ulam spiral - Wikipedia

    en.wikipedia.org/wiki/Ulam_spiral

    The Ulam spiral or prime spiral is a graphical depiction of the set of prime numbers, devised by mathematician Stanisław Ulam in 1963 and popularized in Martin Gardner's Mathematical Games column in Scientific American a short time later. [1] It is constructed by writing the positive integers in a square spiral and specially marking the prime ...

  9. Lucas number - Wikipedia

    en.wikipedia.org/wiki/Lucas_number

    All Fibonacci-like integer sequences appear in shifted form as a row of the Wythoff array; the Fibonacci sequence itself is the first row and the Lucas sequence is the second row. Also like all Fibonacci-like integer sequences, the ratio between two consecutive Lucas numbers converges to the golden ratio.

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