Is the color one tone darker than #f0f0f0?

Question

css

There is #f5f5f5, #f4f4f4, #f3f3f3 ..., #f0f0f0, and what's next? What color is one tone darker than #f0f0f0?

Answer 1

#effefef.
This is the hexadecimal representation of RGB. 2 characters per color.