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 A085425 Number of minus ones in the symmetric signed digit expansion of n with q=2 (i.e., the representation of n in the (-1,0,1)_2 number system). 1
 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 2, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 2, 2, 1, 1, 1, 2, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 3, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 2, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 3, 3, 2, 2, 2, 3, 2, 2, 2, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,11 LINKS C. Heuberger and H. Prodinger, On minimal expansions in redundant number systems: Algorithms and quantitative analysis, Computing 66(2001), 377-393. PROG (PARI) ep(r, n)=local(t=n/2^(r+2)); floor(t+5/6)-floor(t+4/6)-floor(t+2/6)+floor(t+1/6); a(n)=sum(r=0, log(3*n)\log(2)-1, (ep(r, n) == 1)) ; CROSSREFS Cf. A005578, A085423, A007302 (nonzeros), A057526 (0's), A085424 (1's). Sequence in context: A122433 A056977 A309144 * A244250 A167230 A093658 Adjacent sequences:  A085422 A085423 A085424 * A085426 A085427 A085428 KEYWORD nonn,easy,base AUTHOR Ralf Stephan, Jun 30 2003 STATUS approved

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Last modified January 29 04:57 EST 2020. Contains 331335 sequences. (Running on oeis4.)