id:A050294 - OEIS Search Results

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Maximum cardinality of a weakly triple-free subset of {1, 2, ..., n}.

+0
2

1, 2, 2, 3, 4, 4, 5, 6, 7, 8, 9, 9, 10, 11, 11, 12, 13, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 22, 23, 24, 24, 25, 26, 27, 28, 29, 29, 30, 31, 31, 32, 33, 34, 35, 36, 36, 37, 38, 38, 39, 40, 40, 41, 42, 42, 43, 44, 44, 45, 46, 47, 48, 49, 49, 50, 51, 51, 52, 53, 54, 55 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`Bruce Reznick, Problem 1440, Mathematics Magazine, Vol. 67 (1994).`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	FORMULA	`Take r = 3 in a(n) = (r n + sum [k = 0 to m] (-1)^k b(k)) / (r + 1), where [b(m) b(m-1) ... b(0)] is the base-r representation of n. - Rob Pratt (Rob.Pratt(AT)sas.com), Apr 21 2004`
	CROSSREFS	`Cf. A050291-A050296.` `Sequence in context: A103354 A127038 A051068 this_sequence A097950 A011885 A008672` `Adjacent sequences: A050291 A050292 A050293 this_sequence A050295 A050296 A050297`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com)`
	EXTENSIONS	`More terms from John W. Layman (layman(AT)math.vt.edu), Oct 25 2002`

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Last modified December 4 14:15 EST 2008. Contains 151279 sequences.

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