id:A087843 - OEIS Search Results

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a[n] =a[n - a[n-1]] + a[a[a[n - a[n-2]]]]

+0
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1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 7, 6, 7, 7, 7, 7, 7, 9, 7, 9, 8, 9, 9, 9, 9, 9, 11, 9, 11, 9, 11, 10, 11, 11, 11, 11, 11, 13, 11, 13, 11, 13, 11, 13, 12, 13, 13, 13, 13, 13, 16, 13, 15, 13, 16, 15, 15, 13, 16, 16, 15, 16, 16, 16, 16, 16, 19, 16, 18, 16, 19, 18, 19, 19, 18 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`The fourth recursive of HofstadterQ second term of A005185.`
	MATHEMATICA	`Hofstadter[n_Integer?Positive] := Hofstadter[n] = Hofstadter[n - Hofstadter[n-1]] + Hofstadter[Hofstadter[Hofstadter[n - Hofstadter[n-2]]]] Hofstadter[1] = Hofstadter[2] = 1 digits=200 a1=Table[Hofstadter[n], {n, 1, digits}]`
	CROSSREFS	`Cf. A005185, A081831.` `Adjacent sequences: A087840 A087841 A087842 this_sequence A087844 A087845 A087846` `Sequence in context: A130146 A113764 A130148 this_sequence A087831 A058032 A056155`
	KEYWORD	`nonn`
	AUTHOR	`Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 07 2003`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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