A037867 a(n)=(number of digits <=3)-(number of digits >3) in base 8 representation of n.

1, 1, 1, -1, -1, -1, -1, 2, 2, 2, 2, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, -2, -2, -2, -2, 0, 0, 0, 0, -2, -2, -2, -2, 0, 0, 0, 0, -2, -2, -2, -2, 0, 0, 0, 0, -2, -2, -2, -2, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3

Offset

0,8

Links

Table of n, a(n) for n=0..79.

Mathematica

d8[n_]:=Module[{idn8=IntegerDigits[n, 8], lt4}, lt4=Count[idn8, _?(#<4&)]; 2lt4-Length[idn8]]; Array[d8, 80] (* Harvey P. Dale, Oct 22 2011 *)

Crossrefs

Sequence in context: A230630 A343957 A338505 * A122879 A037866 A333181

Adjacent sequences: A037864 A037865 A037866 * A037868 A037869 A037870

Keyword

sign,base

Author

Clark Kimberling

Status

approved