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A094708
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Size of the smallest set hitting all {x, 2x, 3x} contained in D(n) = the first n 3-smooth numbers {1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27,...} (A003586).
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3
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0, 0, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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COMMENTS
| A057561(n) = n - a(n) [From S. R. Finch (Steven.Finch(AT)inria.fr), Feb 25 2009]
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REFERENCES
| F. Chung, P. Erdos and R. L. Graham, On Sparse Sets Hitting Linear Forms, in Number Theory for the Millennium I (M. A. Bennett et al., eds.), pp. 257-272.
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LINKS
| S. R. Finch, Triple-Free Sets of Integers
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CROSSREFS
| A057561 [From S. R. Finch (Steven.Finch(AT)inria.fr), Feb 25 2009]
Sequence in context: A028829 A130855 A100196 * A039730 A152595 A176844
Adjacent sequences: A094705 A094706 A094707 * A094709 A094710 A094711
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KEYWORD
| nonn
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AUTHOR
| Barry Cipra (bcipra(AT)rconnect.com), Jun 15 2004
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