OFFSET
10,2
COMMENTS
A set is called nondividing if no element divides the sum of any nonempty subset of the other elements.
LINKS
Eric Weisstein's World of Mathematics, Nondividing Set
EXAMPLE
a(10) = 1 because there is one 4-element nondividing subset of {1,2,...,10}: {6,7,9,10}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Mar 10 2011
STATUS
approved