A037863 - OEIS

A037863

a(n)=(number of digits <=1)-(number of digits >1) in base 4 representation of n.

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

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OFFSET

0,4

LINKS

Table of n, a(n) for n=0..74.

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

Adjacent sequences: A037860 A037861 A037862 * A037864 A037865 A037866

KEYWORD

base,sign

AUTHOR

Clark Kimberling

STATUS

approved