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A187494 Number of 7-element nondividing subsets of {1, 2, ..., n}. 1
1, 1, 3, 3, 5, 5, 9, 12, 21, 27, 41, 46, 74, 99, 137, 153, 203, 307, 414, 464, 612, 788, 1126, 1292, 1645, 2039, 2614, 3291, 4120, 5127, 6356, 7180, 9786 (list; graph; refs; listen; history; text; internal format)
OFFSET

43,3

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=43..75.

Eric Weisstein's World of Mathematics, Nondividing Set

EXAMPLE

a(43) = 1 because there is one 7-element nondividing subset of {1,2,...,43}: {24,28,31,35,36,40,43}.

CROSSREFS

Column 7 of triangle A187489. Cf. A068063.

Sequence in context: A147040 A146277 A050822 * A283843 A241508 A099536

Adjacent sequences:  A187491 A187492 A187493 * A187495 A187496 A187497

KEYWORD

nonn,more

AUTHOR

Alois P. Heinz, Mar 10 2011

STATUS

approved

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Last modified November 27 07:28 EST 2021. Contains 349365 sequences. (Running on oeis4.)