A157245 Decimal expansion of estimate of 1 - (the weakly triple-free set constant).

1, 9, 9, 6, 8, 0, 5, 1, 6, 1, 9, 7

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

Table of n, a(n) for n=0..11.

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

Cf. A157244.

Sequence in context: A346444 A085984 A335011 * A334846 A072908 A217695

Adjacent sequences: A157242 A157243 A157244 * A157246 A157247 A157248

Keyword

cons,more,nonn

Author

Steven Finch, Feb 25 2009

Status

approved