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 A089310 Write n in binary; a(n) = number of 1's in second block of 1's from right. 3
 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; refs; listen; history; text; internal format)
 OFFSET 0,14 LINKS EXAMPLE 13 = 1101 so a(13) = 2. PROG (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) /* Ralf Stephan */ CROSSREFS Cf. A089309-A089313. Sequence in context: A228601 A269247 A330268 * A129753 A307247 A147693 Adjacent sequences:  A089307 A089308 A089309 * A089311 A089312 A089313 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Dec 22 2003 EXTENSIONS More terms from Ralf Stephan, Feb 01 2004 STATUS approved

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Last modified September 19 09:06 EDT 2020. Contains 337178 sequences. (Running on oeis4.)