A043529 - OEIS

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A043529

Number of distinct base 2 digits of n.

1, 1, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..90.`
	FORMULA	`This is 2 unless n = 2^k - 1 for some k in which case it is 1.`
	MAPLE	`A043529 := proc(n): if type(ln(n+1)/ln(2), integer) then 1 else 2 fi: end proc: seq(A043529(n), n=0..90); # Johannes W. Meijer, Sep 14 2012`
	CROSSREFS	`Contribution from Johannes W. Meijer, May 24 2009: (Start)` `Factor of A160466.` `Cf. A007456 and A081729.` `(End)` `Sequence in context: A083952 A214860 A160242 * A201219 A080942 A099812` `Adjacent sequences: A043526 A043527 A043528 * A043530 A043531 A043532`
	KEYWORD	`nonn,base,easy`
	AUTHOR	`Clark Kimberling`
	EXTENSIONS	`First term added and offset changed by Johannes W. Meijer, May 15 2009`
	STATUS	`approved`

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Last modified May 24 11:30 EDT 2013. Contains 225620 sequences.