id:A087232 - OEIS Search Results

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a(n) is the largest odd term in 3x+1 trajectory initiated at n; 3a(n)+1 gives the largest term: 3.A087232[n]+1=A025586[n].

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1, 1, 5, 1, 5, 5, 17, 1, 17, 5, 17, 5, 13, 17, 53, 1, 17, 17, 29, 5, 21, 17, 53, 5, 29, 13, 3077, 17, 29, 53, 3077, 1, 33, 17, 53, 17, 37, 29, 101, 5, 3077, 21, 65, 17, 45, 53, 3077, 5, 49, 29, 77, 13, 53, 3077, 3077, 17, 65, 29, 101, 53, 61, 3077, 3077, 1, 65, 33, 101, 17, 69 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n)=3077 corresponds to peak=9232.`
	MATHEMATICA	`c[x_] := (1-Mod[x, 2])(x/2)+Mod[x, 2](3*x+1); c[1]=1; fpl[x_] := Delete[FixedPointList[c, x], -1] ofp[x_] := Part[fpl[x], Flatten[Position[OddQ[fpl[x]], True]]] Table[Max[ofp[w]], {w, 1, 256}]`
	CROSSREFS	`Cf. A025586.` `Sequence in context: A021198 A143969 A162797 this_sequence A151780 A054244 A093562` `Adjacent sequences: A087229 A087230 A087231 this_sequence A087233 A087234 A087235`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Sep 18 2003`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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