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 A166267 Number of 1's in the binary representation of A000129(n). 1
 0, 1, 1, 2, 2, 4, 3, 4, 4, 7, 5, 8, 6, 7, 10, 11, 10, 8, 13, 12, 12, 14, 16, 17, 11, 14, 17, 20, 16, 17, 19, 21, 23, 17, 17, 19, 24, 24, 25, 18, 29, 26, 29, 26, 26, 29, 35, 29, 26, 40, 29, 33, 33, 38, 36, 34, 28, 38, 42, 40, 37, 34, 40, 27, 45, 35, 37, 41, 40, 44, 48, 45, 41, 45 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS FORMULA a(n) = A000120(A000129(n)). - R. J. Mathar, Oct 28 2009 MATHEMATICA Clear[a, b, c, f, n, lst] f[n_]:=Plus@@IntegerDigits[n, 2]; a=1; b=0; c=0; lst={b}; Do[c=a+b+c; AppendTo[lst, f[c]]; a=b; b=c, {n, 5!}]; lst PROG (Python) def A000129(n):     if n <=1:         return n     else:         return 2*A000129(n-1)+A000129(n-2) def A000120(n):     a=0     sh=n     while sh > 0:         a += sh & 1         sh >>= 1     return a def A166267(n):     return A000120(A000129(n)) print([A166267(n) for n in range(30)]) # R. J. Mathar, Oct 18 2009 CROSSREFS Sequence in context: A319397 A094950 A087874 * A117484 A086835 A046701 Adjacent sequences:  A166264 A166265 A166266 * A166268 A166269 A166270 KEYWORD nonn,base,easy AUTHOR Vladimir Joseph Stephan Orlovsky, Oct 10 2009 EXTENSIONS Keyword:base added by R. J. Mathar, Oct 28 2009 Offset changed to 0 by Georg Fischer, Dec 19 2020 STATUS approved

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Last modified January 24 01:14 EST 2021. Contains 340398 sequences. (Running on oeis4.)