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  2. Ulam spiral - Wikipedia

    en.wikipedia.org/wiki/Ulam_spiral

    The number 1 has only a single factor, itself; each prime number has two factors, itself and 1; composite numbers are divisible by at least three different factors. Using the size of the dot representing an integer to indicate the number of factors and coloring prime numbers red and composite numbers blue produces the figure shown.

  3. Grid method multiplication - Wikipedia

    en.wikipedia.org/wiki/Grid_method_multiplication

    The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.

  4. Langton's ant - Wikipedia

    en.wikipedia.org/wiki/Langton's_ant

    L 1 L 2 NUL 2 L 1 R 2: Hexagonal grid, spiral growth. R 1 R 2 NUR 2 R 1 L 2 : Animation. The hexagonal grid permits up to six different rotations, which are notated here as N (no change), R 1 (60° clockwise), R 2 (120° clockwise), U (180°), L 2 (120° counter-clockwise), L 1 (60° counter-clockwise).

  5. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  6. Logic puzzle - Wikipedia

    en.wikipedia.org/wiki/Logic_puzzle

    The logic puzzle was first produced by Charles Lutwidge Dodgson, who is better known under his pen name Lewis Carroll, the author of Alice's Adventures in Wonderland.In his book The Game of Logic he introduced a game to solve problems such as confirming the conclusion "Some greyhounds are not fat" from the statements "No fat creatures run well" and "Some greyhounds run well". [1]

  7. Multigrid method - Wikipedia

    en.wikipedia.org/wiki/Multigrid_method

    In cases where the system has a high condition number, the correction procedure is modified such that only a fraction of the prolongated coarser grid solution is added onto the finer grid. These steps can be used as shown in the MATLAB style pseudo code for 1 iteration of V-Cycle Multigrid :

  8. Mathematical table - Wikipedia

    en.wikipedia.org/wiki/Mathematical_table

    Mathematical tables are lists of numbers showing the results of a calculation with varying arguments.Trigonometric tables were used in ancient Greece and India for applications to astronomy and celestial navigation, and continued to be widely used until electronic calculators became cheap and plentiful in the 1970s, in order to simplify and drastically speed up computation.

  9. 200 (number) - Wikipedia

    en.wikipedia.org/wiki/200_(number)

    The number appears in the Padovan sequence, preceded by 86, 114, 151 (it is the sum of the first two of these). [1] The sum of Euler's totient function φ(x) over the first twenty-five integers is 200. 200 is the smallest base 10 unprimeable number – it cannot be turned into a prime number by changing just one of its digits to any other digit.