OFFSET
0,1
EXAMPLE
a(2) = 9 tau(9) = 3, a(3) = 36 tau(36) = 9 etc.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Oct 21 2002
EXTENSIONS
Corrected and extended by Sascha Kurz, Jan 22 2003
STATUS
approved