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mathematical analysis > calculus > sequence > integer sequence > look-and-say sequence

Terme préférentiel

look-and-say sequence  

Définition(s)

  • In mathematics, the look-and-say sequence is the sequence of integers beginning as follows :
    1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, 31131211131221, ... (sequence A005150 in the OEIS).
    To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. For example :
    - 1 is read off as "one 1" or 11.
    - 11 is read off as "two 1s" or 21.
    - 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.
    (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Look-and-say_sequence)

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http://data.loterre.fr/ark:/67375/PSR-X2F4NDFX-4

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