

A187550


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


1



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

65,1


COMMENTS

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


LINKS

Table of n, a(n) for n=65..80.
Eric Weisstein's World of Mathematics, Nondividing Set


EXAMPLE

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


CROSSREFS

Column 8 of triangle A187489. Cf. A068063.
Sequence in context: A036032 A008813 A133463 * A307818 A057492 A178715
Adjacent sequences: A187547 A187548 A187549 * A187551 A187552 A187553


KEYWORD

nonn,more


AUTHOR

Alois P. Heinz, Mar 11 2011


STATUS

approved



