id:A089310 - OEIS Search Results

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Write n in binary; a(n) = number of 1's in second block of 1's from right.

+0
4

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

	OFFSET	`0,14`
	EXAMPLE	`13 = 1101 so a(13) = 2.`
	PROGRAM	`(PARI) a(n)=local(b, c, s):b=binary(n):c=length(b):while(!b[c], c=c-1):while(c>0&&b[c], c=c-1): if(c<=0, 0, while(!b[c], c=c-1):s=0:while(c>0&&b[c], c=c-1:s=s+1):s) (from R. Stephan)`
	CROSSREFS	`Cf. A089309-A089313.` `Sequence in context: A159459 A143078 A106405 this_sequence A129753 A147693 A070936` `Adjacent sequences: A089307 A089308 A089309 this_sequence A089311 A089312 A089313`
	KEYWORD	`nonn,base`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Dec 22 2003`
	EXTENSIONS	`More terms from R. Stephan, Feb 01 2004`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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