A037865 a(n)=(number of digits <=2)-(number of digits >2) in base 6 representation of n.

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

Offset

1,6

Links

Table of n, a(n) for n=1..81.

Maple

A037865 := proc(n)
    a := 0 ;
    dgs := convert(n, base, 6);
    for i from 1 to nops(dgs) do
        if op(i, dgs)<=2 then
            a := a+1 ;
        else
            a := a-1 ;
        end if;
    end do:
    a ;
end proc: # R. J. Mathar, Jan 27 2025

Crossrefs

Sequence in context: A163326 A028953 A348648 * A039969 A039967 A258133

Adjacent sequences: A037862 A037863 A037864 * A037866 A037867 A037868

Keyword

base,sign

Author

Clark Kimberling

Status

approved