login
This site is supported by donations to The OEIS Foundation.

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139121 Total number of letters in the preceding terms spelled out in French. 2
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

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(n-1))), 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

Corrected offset (according to wording of example) and 9-th term, calculated terms beyond a(9). M. F. Hasler, Sep 29 2011.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified April 24 03:45 EDT 2014. Contains 240947 sequences.