OFFSET
0,2
EXAMPLE
a(12)=4032; 2*4032 = 8064; digit sum is 18; decrease until we get a number with digit sum 9, which is 8001; so a(13) = 8001. - From N. J. A. Sloane, Oct 08 2012
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Paul Curtz, Jun 15 2008
EXTENSIONS
Keyword base added by Reinhard Zumkeller, Feb 25 2010
STATUS
approved