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 A196564 Number of odd digits in decimal representation of n. 44
 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 0, 1, 0, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,12 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 FORMULA a(n) = A055642(n) - A196563(n); a(A014263(n)) = 0; a(A007957(n)). From Hieronymus Fischer, May 30 2012: (Start) a(n) = sum_{j=0..m} (floor(n/(2*10^j) + (1/2)) - floor(n/(2*10^j)), where m=floor(log_10(n)). a(10n+k) = a(n) + a(k), 0<=k<10, n>=0. a(n) = a(floor(n/10)) + a(n mod 10), n>=0. a(n) = sum_{j=0..m} a(floor(n/10^j) mod 10), n>=0. a(A014261(n)) = floor(log_5(4n+1)), n>0. G.f.: g(x) = (1/(1-x))*sum_{j>=0} x^10^j/(1+x^10^j). (End) MAPLE A196564 := proc(n)         if n =0 then                 0;         else                 convert(n, base, 10) ;                 add(d mod 2, d=%) ;         end if: end proc: # R. J. Mathar, Jul 13 2012 MATHEMATICA Table[Total[Mod[IntegerDigits[n], 2]], {n, 0, 100}] (* Zak Seidov, Oct 13 2015 *) PROG (Haskell) a196564 n = length [d | d <- show n, d `elem` "13579"] -- Reinhard Zumkeller, Feb 22 2012, Oct 04 2011 (PARI) a(n) = #select(x->x%2, digits(n)); \\ Michel Marcus, Oct 14 2015 CROSSREFS Cf. A014261, A014263, A027868, A046034, A055640, A055641, A055642, A061217, A102669-A102685, A122640, A196563. Sequence in context: A111621 A326398 A140195 * A196563 A198890 A305831 Adjacent sequences:  A196561 A196562 A196563 * A196565 A196566 A196567 KEYWORD nonn,easy,base AUTHOR Reinhard Zumkeller, Oct 04 2011 STATUS approved

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Last modified June 20 15:52 EDT 2021. Contains 345165 sequences. (Running on oeis4.)