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 A139121 Total number of letters in the preceding terms spelled out in French. 3
 0, 4, 10, 13, 19, 26, 34, 46, 57, 70, 81, 94, 113, 123, 137, 151, 168, 184, 205, 217, 232, 250, 267, 287, 310, 322, 340, 357, 379, 403, 418, 435, 455, 478, 503, 516, 529, 546, 565, 585, 608, 619, 633, 651, 671, 692, 715, 729, 746, 765, 785, 808, 820, 833, 852, 873, 895, 920, 933, 952, 973, 995, 1020 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 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. The sequence of words is: zero, quatre, dix, treize, dix-neuf, vingt-six, trente-quatre, quarante-six, cinquante-sept, ... Hyphens, accents and spaces are not counted. For an English version see A139097. REFERENCES E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris. LINKS EXAMPLE 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. PROG (PARI) A139121(n)={ n>1 & return( #select(Vec(French(n=A139121(n-1))), x->x>"@")+n )}  /* see A167507 for French() */  \\ M. F. Hasler, Sep 29 2011 CROSSREFS Cf. A005589, A060403, A139097. Sequence in context: A310358 A143804 A152843 * A310359 A079932 A191107 Adjacent sequences:  A139118 A139119 A139120 * A139122 A139123 A139124 KEYWORD nonn,word AUTHOR N. J. A. Sloane (based on Angelini's article), Jun 08 2008, Jun 15 2008 EXTENSIONS Offset and a(9) corrected (according to wording of example) and terms beyond a(9) from M. F. Hasler, Sep 29 2011 STATUS approved

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Last modified March 20 09:48 EDT 2019. Contains 321345 sequences. (Running on oeis4.)