I asked somewhere else, but got no response.

Maybe someone here can help me understand this image.

When solving for a particular value of i

where i == digit, am I correct in converting that image to this ?

answer = 1/16^digit * (4/8*digit+1 - 2/8*digit+4 - 1/8*digit+5 - 1/8*digit+6)

is a multiplication implied with number(number) in that image ?

thanks