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Let the binary expansion of n be n = Sum_{k} 2^{r_k}, let e(n) be the number of r_k's that are even, o(n) the number that are odd; sequence gives e(n).

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0, 1, 0, 1, 1, 2, 1, 2, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 3, 2, 3, 1, 2, 1, 2, 2, 3, 2, 3, 0, 1, 0, 1, 1, 2, 1, 2, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 3, 2, 3, 1, 2, 1, 2, 2, 3, 2, 3, 1, 2, 1, 2, 2, 3, 2, 3, 1, 2, 1, 2, 2, 3, 2, 3, 2, 3, 2, 3, 3, 4, 3, 4, 2, 3, 2, 3, 3, 4, 3, 4, 1, 2, 1 (list; graph; listen)

	OFFSET	`0,6`
	COMMENT	`e(n)+o(n) = A000120(n), the binary weight of n.`
	LINKS	`N. J. A. Sloane, Fortran program for this and related sequences`
	EXAMPLE	`If n = 43 = 2^0+2^2+2^3+2^5, e(43)=1, o(43)=3.`
	PROGRAM	`See link for Fortran program.`
	CROSSREFS	`Cf. A000120, A139352-A139355, A039004, A139370-A139373.` `Adjacent sequences: A139348 A139349 A139350 this_sequence A139352 A139353 A139354` `Sequence in context: A070088 A131851 A104886 this_sequence A125925 A036578 A077402`
	KEYWORD	`nonn`
	AUTHOR	`Nadia Heninger (nadiah(AT)cs.princeton.edu) and njas, Jun 07 2008`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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