A160357 - OEIS

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A160357

Sign of first differences of Recamán's sequence A005132.

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; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n = 1..10000`
	FORMULA	`a(n) = sign(A005132(n)-A005132(n-1)) = sign(A160356(n)) = (-1)^A160351(n) = -(-1)^A076213(n-1).` `a(n) = (A005132(n)-A005132(n-1))/n. - N. J. A. Sloane, Jul 15 2011` `A160357 = chi_A057165 - chi_A057166, where chi_A denotes the characteristic function of (the set of values of) A.`
	MAPLE	`A160357 := proc(n)` `sign( A005132(n)-A005132(n-1)) ;` `end proc: # R. J. Mathar, Apr 01 2012`
	CROSSREFS	`Cf. A005132, A119632.` `Sequence in context: A121238 A131554 A153881 * A057077 A070748 A154990` `Adjacent sequences: A160354 A160355 A160356 * A160358 A160359 A160360`
	KEYWORD	`sign`
	AUTHOR	`M. F. Hasler, Jun 03 2009`
	STATUS	`approved`

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Last modified November 20 14:53 EST 2018. Contains 317402 sequences. (Running on oeis4.)