

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
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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, dixneuf, vingtsix, trentequatre, quarantesix, cinquantesept, ...
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. 3235, Volume 59 (Jeux math'), April/June 2008, Paris.


LINKS

Table of n, a(n) for n=1..63.


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(n1))), x>x>"@")+n )} /* see A167507 for French() */ \\ M. F. Hasler, Sep 29 2011


CROSSREFS

Cf. A005589, A060403, A139097.
Sequence in context: A087444 A143804 A152843 * A079932 A191107 A173931
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



