OFFSET
0,2
COMMENTS
The sequence of words is: zero, four, eight, thirteen, twenty-one, thirty, ... (in American English).
Hyphens and spaces are not counted.
This is an English version of the sequence in A139121.
a(0) = 0, a(n+1) = a(n) + A005589(a(n)). - Jonathan Vos Post, Jun 15 2008
REFERENCES
E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.
LINKS
M. F. Hasler, Table of n, a(n) for n = 0..423
EXAMPLE
The second word is "four" (and so a(2)=4), because at the end of the first word we can see four letters to the left.
CROSSREFS
KEYWORD
nonn,word,easy
AUTHOR
Jonathan Vos Post, May 12 2007
EXTENSIONS
Edited by N. J. A. Sloane, Jun 08 2008
More terms from M. F. Hasler and R. J. Mathar, Jun 15 2008
STATUS
approved