OFFSET
0,3
COMMENTS
For n>0, twice the number of proper divisors of n (d|n, d<n).
LINKS
Claude Lenormand, Deux transformations sur les mots, Preprint, 5 pages, Nov 17 2003. Apparently unpublished. This is a scanned copy of the version that the author sent to me in 2003.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 20 2018
STATUS
approved