id:A087253 - OEIS Search Results

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Number of distinct initial values of various 3x+1 trajectories of which the peak-value equals 4n.

+0
2

1, 1, 0, 6, 1, 1, 0, 1, 0, 3, 0, 1, 12, 1, 0, 3, 1, 1, 0, 1, 1, 8, 0, 1, 3, 1, 0, 3, 1, 0, 0, 1, 1, 3, 0, 1, 3, 1, 0, 13, 0, 1, 0, 1, 1, 3, 0, 1, 8, 1, 0, 3, 1, 0, 0, 1, 1, 6, 0, 1, 3, 0, 0, 3, 1, 1, 0, 1, 1, 3, 0, 1, 0, 1, 0, 14, 1, 1, 0, 1, 1, 0, 0, 1, 6, 1, 0, 3, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 3, 1, 1, 0, 1, 0 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`n=13: a(13)=12 because peak=4.13=52` `occurs at the following 12 initial values:` `{7,9,11,14,17,18,22,28,34,36,44,52};` `this list differs from trajectory started at iv=52.` `Impossible peaks of 4k form are listed in A087252` `(corresponding to a[x]=0).`
	CROSSREFS	`Cf. A025586.` `Sequence in context: A114153 A119832 A166141 this_sequence A143532 A167155 A080219` `Adjacent sequences: A087250 A087251 A087252 this_sequence A087254 A087255 A087256`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Sep 08 2003`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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