What is the legality of the following series? 1,11,21,1211,111221,312211,132221,11133211,31231221,13111213112211,111331121113212221...
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1what do you mean by 'legal'? – collapsar Apr 01 '14 at 18:13
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i mean what is the rule... – dmitriy Apr 01 '14 at 18:14
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2It's the "talky" (my own personal name for it) series (pronounce it loudly): one, one-one, two-ones, (one-two, two ones), (one-one, one-two, two-ones), ... – DonAntonio Apr 01 '14 at 18:14
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A really silly sequence. See this. – André Nicolas Apr 01 '14 at 18:15
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wow, i get it. thanks! – dmitriy Apr 01 '14 at 18:16
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1Simple bonus question: Why are all digits $\le 3$? – Hagen von Eitzen Apr 01 '14 at 18:49
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can you prove it? – dmitriy Apr 01 '14 at 18:51
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https://en.wikipedia.org/wiki/Look-and-say_sequence – Memming Apr 03 '14 at 03:10
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@HagenvonEitzen can you prove it please? – dmitriy Jan 01 '16 at 16:47
1 Answers
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Each terms enumerates the number of each present natural number in the previous one:
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11 is one 1
21 is two 1
1211 is one 2 one 1 and so on
Jean-Sébastien
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