OFFSET
2,3
LINKS
Eric Weisstein's World of Mathematics, Proper Divisor
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Nov 26 2003, corrected May 08 2004
EXTENSIONS
Edited by N. J. A. Sloane, Aug 19 2008 at the suggestion of Leroy Quet
STATUS
approved