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Look-and-say sequence: Difference between revisions
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→{{header|Mathematica}}/{{header|Wolfram Language}}
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<lang Mathematica> LookAndSay[n_Integer?Positive]:= Map[Reverse, Tally /@ Split @ IntegerDigits @ n, 2] // Flatten // FromDigits</lang>
takes as input an <em>arbitrary</em> positive integer
The first example returns the next 12 numbers of the sequence starting with 1:
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