OFFSET
1,7
MAPLE
A037881 := proc(n)
local a, dgs, dgsE ;
a := 0 ;
dgs := convert(n, base, 4);
dgsE := sort(dgs) ;
for i from 1 to nops(dgs) do
a := a+ abs(op(i, dgs)-op(i, dgsE)) ;
end do:
a/2 ;
end proc: # R. J. Mathar, Oct 19 2015
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Definition swapped with A037872. - R. J. Mathar, Oct 19 2015
STATUS
approved