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Search: id:A157245
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| A157245 |
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Decimal expansion of estimate of 1 - (the weakly triple-free set constant). |
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+0
2
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| 1, 9, 9, 6, 8, 0, 5, 1, 6, 1, 9, 7
(list; cons; graph; listen)
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OFFSET
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0,2
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COMMENT
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This is the asymptotic density of minimal sets in {1,..,n} hitting every set {x,2x,3x}, as n approaches infinity.
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LINKS
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S. R. Finch, Triple-Free Sets of Integers
F. R. K. Chung, P. Erdos and R. L. Graham, On Sparse Sets Hitting Linear Forms, Number Theory for the Millennium, v. 1, Proc. 2000 Urbana conf., A. K. Peters, 2002, pp. 257-272.
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EXAMPLE
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0.199680516197 = 1 - 0.800319483802...
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CROSSREFS
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Cf. A157244.
Sequence in context: A157293 A146487 A085984 this_sequence A072908 A019895 A144669
Adjacent sequences: A157242 A157243 A157244 this_sequence A157246 A157247 A157248
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KEYWORD
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cons,more,nonn
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AUTHOR
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S. R. Finch (Steven.Finch(AT)inria.fr), Feb 25 2009
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