"It is indeed possible to derive a scaled set of integer values that could meet the 0::0, 5::5 , 255::255000 display range."

Of course - as I said:

"Do you have some non-linear scaling function in mind?"

But we still need to know why the 0 & 5 values use only 4 digits (with leading zeros).
With your function, what happens at 16 (the first 5-digit display value) and 105 (the first 6-digit display value)?
do they have any leading zeros?

We still need Suresh to clearly define what on earth he's up to!