What group 0 3 6 27 80 part of?

Answer 1

I am assuming the you do not mean "group", which has a very specific mathematical meaning, but "set".

The numbers belong to any set that will contain them! For example,

{0, 3, 6, 27, 80};

{0, 3, pi, 6, sqrt(105), 27, 80};

N, the set of natural numbers,

Z, the set of integers,

Q, the set of rational numbers,

R, the set of real numbers,

C, the set of complex numbers,

the set of integers between -30 and +130,

the set of rational numbers between -97/4 and 641/5,

the set of positive square roots of all non-negative numbers less than 9000.