I am struggling to find a name for the the series that file permissions in unix are represented by.
The numbers which can add up to a unique sum and no other combination of numbers from that set can add up to that unique sum.
The numbers in series are 1,2,4,.....?
So, Just to have an answer to my question, the CHMOD numbers are called Bitmask and they are basically binary numbers starting from 2 and proceeding with the power of 2 each time.
One thing useful about this series is that no two numbers from this series add up to any other number from this series.