id:A160357 - OEIS Search Results

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Sign of first differences of Recaman's sequence A005132.

+0
4

1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = sign(A005132(n)-A005132(n-1)) = sign(A160356(n)) = (-1)^A160351(n) = -(-1)^A076213(n-1).` `A160357 = chi_A057165 - chi_A057166, where chi_A denotes the characteristic function of (the set of values of) A.`
	CROSSREFS	`Sequence in context: A121238 A131554 A153881 this_sequence A070748 A154990 A156734` `Adjacent sequences: A160354 A160355 A160356 this_sequence A160358 A160359 A160360`
	KEYWORD	`sign`
	AUTHOR	`M. F. Hasler (MHasler(AT)univ-ag.fr), Jun 03 2009`

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

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