A187493 Number of 6-element nondividing subsets of {1, 2, ..., n}.

1, 3, 4, 7, 15, 27, 45, 55, 85, 133, 199, 262, 378, 534, 803, 999, 1319, 1742, 2309, 3007, 4020, 5166, 6565, 7950, 10380, 12882, 16533, 19664, 24099, 30912, 37550, 44092, 54465, 65117, 79616, 94144, 111780, 132592, 159228, 187506, 219949, 256514

Offset: 31

Author

Alois P. Heinz, Mar 10 2011

Keywords

• nonn

Comments

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

Examples

			a(31) = 1 because there is one 6-element nondividing subset of {1,2,...,31}: {16,19,23,24,28,31}.
		

Links

• Eric Weisstein's World of Mathematics, Nondividing Set

Crossrefs

Column 6 of triangle A187489. Cf. A068063.