id:A071622 - OEIS Search Results

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(-1)*Sum( k =1,n, (-1)^floor((4/3)^k) ).

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1, 2, 1, 2, 1, 2, 3, 4, 5, 6, 7, 8, 7, 6, 5, 6, 7, 8, 7, 8, 7, 6, 7, 6, 5, 6, 5, 6, 7, 8, 7, 6, 7, 8, 7, 6, 5, 6, 7, 8, 9, 10, 11, 12, 11, 10, 9, 10, 11, 10, 9, 8, 7, 8, 7, 8, 7, 8, 9, 10, 9, 8, 9, 8, 9, 8, 7, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 14, 15, 14, 13, 12, 13, 12, 13, 12, 11, 10, 9, 10, 9 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Conjecture : for n>2300, a(n) > ln(n)^2`
	PROGRAM	`(PARI) for(n=1, 100, print1(-sum(i=1, n, sign((-1)^floor((4/3)^i))), ", "))`
	CROSSREFS	`Cf. A071532.` `Adjacent sequences: A071619 A071620 A071621 this_sequence A071623 A071624 A071625` `Sequence in context: A139803 A058746 A080916 this_sequence A135990 A140715 A099986`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 22 2002`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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