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  2. Josephus problem - Wikipedia

    en.wikipedia.org/wiki/Josephus_problem

    (For the more general case , a solution is outlined below.) The solution is expressed recursively. Let () denote the position of the survivor when there are initially n people (and =). The first time around the circle, all of the even-numbered people die. The second time around the circle, the new 2nd person dies, then the new 4th person, etc ...

  3. Latin square - Wikipedia

    en.wikipedia.org/wiki/Latin_square

    The name "Latin square" was inspired by mathematical papers by Leonhard Euler (1707–1783), who used Latin characters as symbols, [2] but any set of symbols can be used: in the above example, the alphabetic sequence A, B, C can be replaced by the integer sequence 1, 2, 3. Euler began the general theory of Latin squares.

  4. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.Numbers are written with combinations of letters from the Latin alphabet, each with a fixed integer value.

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]

  6. ROT13 - Wikipedia

    en.wikipedia.org/wiki/ROT13

    ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet.. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome, used by Julius Caesar in the 1st century BC. [1]

  7. Latin numerals - Wikipedia

    en.wikipedia.org/wiki/Latin_Numerals

    Thus Roman authors would write: ūnae litterae 'one letter', trīnae litterae 'three letters', quīna castra 'five camps', etc. Except for the numbers 1, 3, and 4 and their compounds, the plurale tantum numerals are identical with the distributive numerals (see below).

  8. Numerals in Unicode - Wikipedia

    en.wikipedia.org/wiki/Numerals_in_Unicode

    Grouped by their numerical property as used in a text, Unicode has four values for Numeric Type. First there is the "not a number" type. Then there are decimal-radix numbers, commonly used in Western style decimals (plain 0–9), there are numbers that are not part of a decimal system such as Roman numbers, and decimal numbers in typographic context, such as encircled numbers.

  9. Bell number - Wikipedia

    en.wikipedia.org/wiki/Bell_number

    The 52 possible solutions, counted by the Bell number B 5, were recorded by 52 different diagrams, which were printed above the chapter headings in some editions of The Tale of Genji. [ 26 ] [ 30 ] In Srinivasa Ramanujan 's second notebook, he investigated both Bell polynomials and Bell numbers. [ 31 ]