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