id:A035214 - OEIS Search Results

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2 followed by a run of n 1's.

+0
5

2, 2, 1, 2, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n) = 2 if n is a triangular number, otherwise 1.` `a(n) = floor((3-cos(Pisqrt(8n+1)))/2) - Carl R. White (oeisfan(AT)cyreksoft.yorks.com), Mar 18 2006`
	CROSSREFS	`Cf. A035253, A035254.` `A010054(n) + 1.` `Sequence in context: A029441 A109495 A164295 this_sequence A071292 A088569 A001285` `Adjacent sequences: A035211 A035212 A035213 this_sequence A035215 A035216 A035217`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Typo corrected by Neven Juric, Jan 10 2009`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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