OFFSET
0,2
COMMENTS
This is the asymptotic density of minimal sets in {1,..,n} hitting every set {x,2x,3x}, as n approaches infinity.
LINKS
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.
Steven R. Finch, Triple-Free Sets of Integers [From Steven Finch, Apr 20 2019]
EXAMPLE
0.199680516197 = 1 - 0.800319483802...
CROSSREFS
KEYWORD
AUTHOR
Steven Finch, Feb 25 2009
STATUS
approved