Question

is this exponential???
x is 0 1 2 3 4 5
y is 100 75 56 42 32 24

Answer 1

i havent study this sorry.

Answer 2

its ok! haha

Answer 3

It's doesn't appear to be. See http://oeis.org/A120155.

Of course any sequence of just a few numbers such as this can be constructed in many ways.