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  2. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.

  3. Look-and-say sequence - Wikipedia

    en.wikipedia.org/wiki/Look-and-say_sequence

    21 is read off as "one 2, one 1" or 1211. 1211 is read off as "one 1, one 2, two 1s" or 111221. 111221 is read off as "three 1s, two 2s, one 1" or 312211. The look-and-say sequence was analyzed by John Conway [1] after he was introduced to it by one of his students at a party. [2] [3]

  4. Mnemonic peg system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_peg_system

    There is also the major system, which connects sounds to numbers. [3] [4] The major system is more complicated to learn than simple rhymes or alphabetic pegs, because it associates numbers 0-9 with a specific letter or sound, then larger numbers can combine to create words out of the sounds. [3] It is limitless in the number of pegs it can produce.

  5. English Braille - Wikipedia

    en.wikipedia.org/wiki/English_Braille

    The letter sign is used to force the end of a series of numbers. For example, ⠙ ⠁ da preceded by a number sign, ⠼ ⠙ ⠁, is read as 41. If instead 4a is intended (as in a section or apartment number), then the letter sign is used to force a reading of a rather than 1 for the final character: ⠼ ⠙ ⠰ ⠁ 4a . [25]

  6. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    The Natural Area Code, this is the smallest base such that all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 6 ⁠ terminate, a number n is a regular number if and only if ⁠ 1 / n ⁠ terminates in base 30. 32: Duotrigesimal: Found in the Ngiti language. 33: Use of letters (except I, O, Q) with digits in vehicle registration plates of Hong Kong. 34

  7. ARPABET - Wikipedia

    en.wikipedia.org/wiki/Arpabet

    ARPABET (also spelled ARPAbet) is a set of phonetic transcription codes developed by Advanced Research Projects Agency (ARPA) as a part of their Speech Understanding Research project in the 1970s. It represents phonemes and allophones of General American English with distinct sequences of ASCII characters.

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