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A187550 Number of 8-element nondividing subsets of {1, 2, ..., n}. 1
2, 3, 4, 5, 6, 9, 12, 15, 19, 24, 35, 46, 60, 83, 102, 135 (list; graph; refs; listen; history; text; internal format)
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 8-element 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

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Last modified January 26 08:18 EST 2020. Contains 331278 sequences. (Running on oeis4.)