A136480 - OEIS

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A136480

Number of trailing equal digits in binary representation of n.

1, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 4, 4, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 5, 5, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 4, 4, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 6, 6, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 4, 4, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 5, 5, 1, 1, 2, 2, 1, 1, 3, 3 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	COMMENTS	`a(even) = number of trailing binary zeros;` `a(odd) = number of trailing binary ones;` `a(n) = A050603(n-1) for n>0;` `a(2*n + n mod 2) = a(n) + 1.`
	LINKS	`Index entries for sequences related to binary expansion of n`
	FORMULA	`For n>0: a(n) = A007814(n + n mod 2).`
	MATHEMATICA	`Length[Last[Split[IntegerDigits[#, 2]]]]&/@Range[0, 140] (* From Harvey P. Dale, Mar 31 2011 *)`
	CROSSREFS	`Sequence in context: A064894 A003638 A094267 * A050603 A037162 A027358` `Adjacent sequences: A136477 A136478 A136479 * A136481 A136482 A136483`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 31 2007`

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Last modified February 15 14:30 EST 2012. Contains 205814 sequences.