A187550 Number of 8-element nondividing subsets of {1, 2, ..., n}.

2, 3, 4, 5, 6, 9, 12, 15, 19, 24, 35, 46, 60, 83, 102, 135

Offset: 65

Author

Alois P. Heinz, Mar 11 2011

Keywords

• nonn
• more

Comments

A set is called nondividing if no element divides the sum of any nonempty subset of the other elements.

Examples

			a(65) = 2 because there are two 8-element nondividing subsets of {1,2,...,65}: {36,40,48,49,53,61,64,65}, {30,44,45,49,50,59,64,65}.
		

Links

• Eric Weisstein's World of Mathematics, Nondividing Set

Crossrefs

Column 8 of triangle A187489. Cf. A068063.