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Search: id:A139121
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| A139121 |
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Form a sequence of French words as follows: look to the left, towards the beginning of the sequence and write down the number of letters you see; repeat; then replace the words by the corresponding numbers. |
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+0
2
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OFFSET
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0,2
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COMMENT
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The sequence of words is: zero, quatre, dix, treize, dix-neuf, vingt-six, trente-quatre, quarante-six, cinquante-six, ...
Hyphens, accents and spaces are not counted.
For an English version see A139097.
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REFERENCES
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E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.
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EXAMPLE
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The first word is "zero", because initially there are no letters to the left. The second word is "quatre" (and so a(2)=4), because at the end of the first word we can see four letters to the left. And so on.
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CROSSREFS
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Cf. A005589, A060403, A139097.
Sequence in context: A087444 A143804 A152843 this_sequence A079932 A076270 A032821
Adjacent sequences: A139118 A139119 A139120 this_sequence A139122 A139123 A139124
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KEYWORD
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nonn,word,easy,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com) (based on Angelini's article), Jun 08 2008, Jun 15 2008
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