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A037863
a(n)=(number of digits <=1)-(number of digits >1) in base 4 representation of n.
3
1, -1, -1, 2, 2, 0, 0, 0, 0, -2, -2, 0, 0, -2, -2, 3, 3, 1, 1, 3, 3, 1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -3, -3, -1, -1, -3, -3, 1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -3, -3, -1, -1, -3, -3, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 0, 0
OFFSET
0,4
MAPLE
A037863 := proc(n)
a := 0 ;
dgs := convert(n, base, 4);
for i from 1 to nops(dgs) do
if op(i, dgs)<=1 then
a := a+1 ;
else
a := a-1 ;
end if;
end do:
a ;
end proc: # R. J. Mathar, Oct 16 2015
CROSSREFS
Sequence in context: A035447 A227188 A354107 * A163536 A328828 A276009
KEYWORD
base,sign
STATUS
approved