A043688 - OEIS

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A043688

a(n) = (s(n)-1)/2, where s(n) is the n-th number whose base-2 representation has exactly 5 runs.

10, 18, 20, 21, 22, 26, 34, 36, 37, 38, 40, 41, 43, 44, 45, 46, 50, 52, 53, 54, 58, 66, 68, 69, 70, 72, 73, 75, 76, 77, 78, 80, 81, 83, 87, 88, 89, 91, 92, 93, 94, 98, 100, 101, 102, 104, 105, 107, 108, 109, 110, 114, 116, 117, 118, 122 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) = A238247(n) - 1. - Reinhard Zumkeller, Feb 20 2014`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 1..1000`
	MATHEMATICA	`(#-1)/2&/@Select[Range[400], Length[Split[IntegerDigits[#, 2]]]==5&] (* Harvey P. Dale, Oct 04 2013 *)`
	CROSSREFS	`Cf. A238247.` `Sequence in context: A055567 A373994 A087119 * A004752 A087141 A349090` `Adjacent sequences: A043685 A043686 A043687 * A043689 A043690 A043691`
	KEYWORD	`nonn,base`
	AUTHOR	`Clark Kimberling`
	STATUS	`approved`

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Last modified August 31 00:13 EDT 2024. Contains 375550 sequences. (Running on oeis4.)