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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
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
KEYWORD
nonn,more
AUTHOR
Alois P. Heinz, Mar 10 2011
STATUS
approved

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Last modified June 21 21:50 EDT 2024. Contains 373559 sequences. (Running on oeis4.)