OFFSET
0,2
COMMENTS
Based on the observation by Diane Karloff (see A005589) that the trajectory of l always converges to 4.
The smallest n with a(n) = 6 is 1103323373373373373373373373373 (one nonillion one hundred and three octillion ...) which has 323 letters.
LINKS
R. J. Mathar, Table of n, a(n) for n = 0..11999
R. J. Mathar, Maple program to make b-file
EXAMPLE
5 has four letters so a(5) = 0. 3 has five letters so a(3) = a(5) + 1 = 1.
CROSSREFS
KEYWORD
nonn,word,easy
AUTHOR
N. J. A. Sloane, Nov 27 2007
STATUS
approved